El conteo de tokens te permite determinar cuántos tokens de entrada usará una solicitud antes de enviarla al modelo. Úsalo para:
- Optimizar prompts para que se ajusten a los límites de contexto
- Estimar costos antes de realizar llamadas a la API
- Dirigir solicitudes según su tamaño (por ejemplo, enviar prompts más cortos a modelos más rápidos)
- Evitar sorpresas con imágenes y archivos, sin tener que recurrir a estimaciones basadas en caracteres
El punto de acceso de conteo de tokens de entrada acepta el mismo formato de entrada que la API Responses. Envía texto, mensajes, imágenes, archivos, herramientas o conversaciones. La API devuelve la cantidad exacta de tokens que recibirá el modelo.
El conteo incluye tokens de formato que se usan para representar la estructura de la solicitud, como los roles y los límites de los mensajes. Es posible que estos tokens no aparezcan en el texto o los campos que tokenizas localmente.
Los tokenizadores locales como tiktoken funcionan con texto sin formato, pero tienen limitaciones:
- No admiten imágenes ni archivos ; las estimaciones como
characters / 4 son imprecisas
- Las herramientas y los esquemas agregan tokens que son difíciles de contar localmente
- El comportamiento específico del modelo puede cambiar la tokenización (por ejemplo, el razonamiento o el almacenamiento en caché)
La API de conteo de tokens contempla todos estos casos. Usa el mismo cuerpo de solicitud que enviarías a responses.create y obtén un conteo preciso. Luego incorpora el resultado a tu flujo de validación de mensajes o estimación de costos.
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10import OpenAI from "openai";
const client = new OpenAI();
const response = await client.responses.inputTokens.count({
model: "gpt-6-astra",
input: "Tell me a joke.",
});
console.log(response.input_tokens);
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8from openai import OpenAI
client = OpenAI()
response = client.responses.input_tokens.count(
model="gpt-6-astra", input="Tell me a joke."
)
print(response.input_tokens)
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21package main
import (
"context"
"fmt"
"github.com/openai/openai-go/v3"
"github.com/openai/openai-go/v3/responses"
)
func main() {
client := openai.NewClient()
count, err := client.Responses.InputTokens.Count(context.Background(), responses.InputTokenCountParams{
Model: openai.String("gpt-6-astra"),
Input: responses.InputTokenCountParamsInputUnion{OfString: openai.String("Tell me a joke.")},
})
if err != nil {
panic(err)
}
fmt.Println(count.InputTokens)
}
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15import com.openai.client.OpenAIClient;
import com.openai.client.okhttp.OpenAIOkHttpClient;
import com.openai.models.responses.inputtokens.InputTokenCountParams;
var count =
client
.responses()
.inputTokens()
.count(
InputTokenCountParams.builder()
.model("gpt-6-astra")
.input("Tell me a joke.")
.build());
System.out.println(count.inputTokens());
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10require "openai"
client = OpenAI::Client.new
count = client.responses.input_tokens.count(
model: "gpt-6-astra",
input: "Tell me a joke."
)
puts(count.input_tokens)
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7curl https://api.openai.com/v1/responses/input_tokens \
-H "Authorization: Bearer $OPENAI_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "gpt-6-astra",
"input": "Tell me a joke."
}'
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5openai responses:input-tokens count \
--model gpt-6-astra \
--input "Tell me a joke." \
--raw-output \
--transform input_tokens
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14import OpenAI from "openai";
const client = new OpenAI();
const response = await client.responses.inputTokens.count({
model: "gpt-6-astra",
input: [
{ role: "user", content: "What is 2 + 2?" },
{ role: "assistant", content: "2 + 2 equals 4." },
{ role: "user", content: "What about 3 + 3?" },
],
});
console.log(response.input_tokens);
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13from openai import OpenAI
client = OpenAI()
response = client.responses.input_tokens.count(
model="gpt-6-astra",
input=[
{"role": "user", "content": "What is 2 + 2?"},
{"role": "assistant", "content": "2 + 2 equals 4."},
{"role": "user", "content": "What about 3 + 3?"},
],
)
print(response.input_tokens)
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26package main
import (
"context"
"fmt"
"github.com/openai/openai-go/v3"
"github.com/openai/openai-go/v3/responses"
)
func main() {
client := openai.NewClient()
input := []responses.ResponseInputItemUnionParam{
responses.ResponseInputItemParamOfMessage("What is 2 + 2?", responses.EasyInputMessageRoleUser),
responses.ResponseInputItemParamOfMessage("2 + 2 equals 4.", responses.EasyInputMessageRoleAssistant),
responses.ResponseInputItemParamOfMessage("What about 3 + 3?", responses.EasyInputMessageRoleUser),
}
count, err := client.Responses.InputTokens.Count(context.Background(), responses.InputTokenCountParams{
Model: openai.String("gpt-6-astra"),
Input: responses.InputTokenCountParamsInputUnion{OfResponseInputItemArray: input},
})
if err != nil {
panic(err)
}
fmt.Println(count.InputTokens)
}
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34import com.openai.client.OpenAIClient;
import com.openai.client.okhttp.OpenAIOkHttpClient;
import com.openai.models.responses.EasyInputMessage;
import com.openai.models.responses.ResponseInputItem;
import com.openai.models.responses.inputtokens.InputTokenCountParams;
import java.util.List;
var count =
client
.responses()
.inputTokens()
.count(
InputTokenCountParams.builder()
.model("gpt-6-astra")
.inputOfResponseInputItems(
List.of(
ResponseInputItem.ofEasyInputMessage(
EasyInputMessage.builder()
.role(EasyInputMessage.Role.USER)
.content("What is 2 + 2?")
.build()),
ResponseInputItem.ofEasyInputMessage(
EasyInputMessage.builder()
.role(EasyInputMessage.Role.ASSISTANT)
.content("2 + 2 equals 4.")
.build()),
ResponseInputItem.ofEasyInputMessage(
EasyInputMessage.builder()
.role(EasyInputMessage.Role.USER)
.content("What about 3 + 3?")
.build())))
.build());
System.out.println(count.inputTokens());
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24require "openai"
client = OpenAI::Client.new
conversation = [
{
role: :user,
content: "What is 2 + 2?"
},
{
role: :assistant,
content: "2 + 2 equals 4."
},
{
role: :user,
content: "What about 3 + 3?"
}
]
count = client.responses.input_tokens.count(
model: "gpt-6-astra",
input: conversation
)
puts(count.input_tokens)
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11curl https://api.openai.com/v1/responses/input_tokens \
-H "Authorization: Bearer $OPENAI_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "gpt-6-astra",
"input": [
{"role": "user", "content": "What is 2 + 2?"},
{"role": "assistant", "content": "2 + 2 equals 4."},
{"role": "user", "content": "What about 3 + 3?"}
]
}'
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12openai responses:input-tokens count \
--raw-output \
--transform input_tokens <<'YAML'
model: gpt-6-astra
input:
- role: user
content: What is 2 + 2?
- role: assistant
content: 2 + 2 equals 4.
- role: user
content: What about 3 + 3?
YAML
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11import OpenAI from "openai";
const client = new OpenAI();
const response = await client.responses.inputTokens.count({
model: "gpt-6-astra",
instructions: "You are a helpful assistant that explains concepts simply.",
input: "Explain quantum computing in one sentence.",
});
console.log(response.input_tokens);
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10from openai import OpenAI
client = OpenAI()
response = client.responses.input_tokens.count(
model="gpt-6-astra",
instructions="You are a helpful assistant that explains concepts simply.",
input="Explain quantum computing in one sentence.",
)
print(response.input_tokens)
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22package main
import (
"context"
"fmt"
"github.com/openai/openai-go/v3"
"github.com/openai/openai-go/v3/responses"
)
func main() {
client := openai.NewClient()
count, err := client.Responses.InputTokens.Count(context.Background(), responses.InputTokenCountParams{
Model: openai.String("gpt-6-astra"),
Instructions: openai.String("You are a helpful assistant that explains concepts simply."),
Input: responses.InputTokenCountParamsInputUnion{OfString: openai.String("Explain quantum computing in one sentence.")},
})
if err != nil {
panic(err)
}
fmt.Println(count.InputTokens)
}
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16import com.openai.client.OpenAIClient;
import com.openai.client.okhttp.OpenAIOkHttpClient;
import com.openai.models.responses.inputtokens.InputTokenCountParams;
var count =
client
.responses()
.inputTokens()
.count(
InputTokenCountParams.builder()
.model("gpt-6-astra")
.input("Explain quantum computing in one sentence.")
.instructions("You are a helpful assistant that explains concepts simply.")
.build());
System.out.println(count.inputTokens());
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11require "openai"
client = OpenAI::Client.new
count = client.responses.input_tokens.count(
model: "gpt-6-astra",
instructions: "You are a helpful assistant that explains concepts simply.",
input: "Explain quantum computing in one sentence."
)
puts(count.input_tokens)
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8curl https://api.openai.com/v1/responses/input_tokens \
-H "Authorization: Bearer $OPENAI_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "gpt-6-astra",
"instructions": "You are a helpful assistant that explains concepts simply.",
"input": "Explain quantum computing in one sentence."
}'
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7openai responses:input-tokens count \
--raw-output \
--transform input_tokens <<'YAML'
model: gpt-6-astra
instructions: You are a helpful assistant that explains concepts simply.
input: Explain quantum computing in one sentence.
YAML
Las imágenes consumen tokens según su tamaño y nivel de detalle. La API de conteo de tokens devuelve el conteo exacto, sin conjeturas.
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22import OpenAI from "openai";
const client = new OpenAI();
const response = await client.responses.inputTokens.count({
model: "gpt-6-astra",
input: [
{
role: "user",
content: [
{
type: "input_image",
image_url: "https://example.com/chart.png",
detail: "auto",
},
{ type: "input_text", text: "Summarize this chart." },
],
},
],
});
console.log(response.input_tokens);
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21from openai import OpenAI
client = OpenAI()
# Use file_id from uploaded file, or image_url for a URL
response = client.responses.input_tokens.count(
model="gpt-6-astra",
input=[
{
"role": "user",
"content": [
{
"type": "input_image",
"image_url": "https://example.com/chart.png",
},
{"type": "input_text", "text": "Summarize this chart."},
],
}
],
)
print(response.input_tokens)
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30package main
import (
"context"
"fmt"
"github.com/openai/openai-go/v3"
"github.com/openai/openai-go/v3/responses"
)
func main() {
client := openai.NewClient()
input := []responses.ResponseInputItemUnionParam{
responses.ResponseInputItemParamOfMessage(
responses.ResponseInputMessageContentListParam{
{OfInputImage: &responses.ResponseInputImageParam{ImageURL: openai.String("https://example.com/chart.png"), Detail: responses.ResponseInputImageDetailAuto}},
{OfInputText: &responses.ResponseInputTextParam{Text: "Summarize this chart."}},
},
responses.EasyInputMessageRoleUser,
),
}
count, err := client.Responses.InputTokens.Count(context.Background(), responses.InputTokenCountParams{
Model: openai.String("gpt-6-astra"),
Input: responses.InputTokenCountParamsInputUnion{OfResponseInputItemArray: input},
})
if err != nil {
panic(err)
}
fmt.Println(count.InputTokens)
}
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30import com.openai.client.OpenAIClient;
import com.openai.client.okhttp.OpenAIOkHttpClient;
import com.openai.models.responses.ResponseInputImage;
import com.openai.models.responses.ResponseInputItem;
import com.openai.models.responses.inputtokens.InputTokenCountParams;
import java.util.List;
var count =
client
.responses()
.inputTokens()
.count(
InputTokenCountParams.builder()
.model("gpt-6-astra")
.inputOfResponseInputItems(
List.of(
ResponseInputItem.ofMessage(
ResponseInputItem.Message.builder()
.role(ResponseInputItem.Message.Role.USER)
.addContent(
ResponseInputImage.builder()
.detail(ResponseInputImage.Detail.AUTO)
.imageUrl(
"https://api.nga.gov/iiif/a2e6da57-3cd1-4235-b20e-95dcaefed6c8/full/!800,800/0/default.jpg")
.build())
.addInputTextContent("Summarize this chart.")
.build())))
.build());
System.out.println(count.inputTokens());
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25require "openai"
client = OpenAI::Client.new
count = client.responses.input_tokens.count(
model: "gpt-6-astra",
input: [
{
role: :user,
content: [
{
type: :input_image,
image_url: "https://api.nga.gov/iiif/a2e6da57-3cd1-4235-b20e-95dcaefed6c8/full/!800,800/0/default.jpg",
detail: :auto
},
{
type: :input_text,
text: "Summarize this chart."
}
]
}
]
)
puts(count.input_tokens)
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13curl https://api.openai.com/v1/responses/input_tokens \
-H "Authorization: Bearer $OPENAI_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "gpt-6-astra",
"input": [{
"role": "user",
"content": [
{"type": "input_image", "image_url": "https://example.com/chart.png"},
{"type": "input_text", "text": "Summarize this chart."}
]
}]
}'
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12openai responses:input-tokens count \
--raw-output \
--transform input_tokens <<'YAML'
model: gpt-6-astra
input:
- role: user
content:
- type: input_image
image_url: https://example.com/chart.png
- type: input_text
text: Summarize this chart.
YAML
Puedes usar file_id (de la API de archivos) o image_url (una URL o una URL de datos en base64). Consulta Imágenes y visión para obtener más detalles.
Las definiciones de herramientas (esquemas de funciones, servidores MCP, etc.) agregan tokens al contexto. Cuéntalos junto con los de tu entrada:
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24import OpenAI from "openai";
const client = new OpenAI();
const response = await client.responses.inputTokens.count({
model: "gpt-6-astra",
tools: [
{
type: "function",
name: "get_weather",
description: "Get the current weather in a location",
strict: true,
parameters: {
type: "object",
properties: { location: { type: "string" } },
required: ["location"],
additionalProperties: false,
},
},
],
input: "What is the weather in San Francisco?",
});
console.log(response.input_tokens);
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21from openai import OpenAI
client = OpenAI()
response = client.responses.input_tokens.count(
model="gpt-6-astra",
tools=[
{
"type": "function",
"name": "get_weather",
"description": "Get the current weather in a location",
"parameters": {
"type": "object",
"properties": {"location": {"type": "string"}},
"required": ["location"],
},
}
],
input="What is the weather in San Francisco?",
)
print(response.input_tokens)
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32package main
import (
"context"
"fmt"
"github.com/openai/openai-go/v3"
"github.com/openai/openai-go/v3/responses"
)
func main() {
client := openai.NewClient()
parameters := map[string]any{
"type": "object",
"properties": map[string]any{
"location": map[string]any{"type": "string"},
},
"required": []string{"location"},
"additionalProperties": false,
}
tool := responses.ToolParamOfFunction("get_weather", parameters, true)
tool.OfFunction.Description = openai.String("Get the current weather in a location")
count, err := client.Responses.InputTokens.Count(context.Background(), responses.InputTokenCountParams{
Model: openai.String("gpt-6-astra"),
Input: responses.InputTokenCountParamsInputUnion{OfString: openai.String("What is the weather in San Francisco?")},
Tools: []responses.ToolUnionParam{tool},
})
if err != nil {
panic(err)
}
fmt.Println(count.InputTokens)
}
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37import com.openai.client.OpenAIClient;
import com.openai.client.okhttp.OpenAIOkHttpClient;
import com.openai.core.JsonValue;
import com.openai.models.responses.FunctionTool;
import com.openai.models.responses.inputtokens.InputTokenCountParams;
import java.util.List;
import java.util.Map;
var count =
client
.responses()
.inputTokens()
.count(
InputTokenCountParams.builder()
.model("gpt-6-astra")
.input("What is the weather in San Francisco?")
.addTool(
FunctionTool.builder()
.name("get_weather")
.description("Get the current weather in a location")
.strict(true)
.parameters(
FunctionTool.Parameters.builder()
.putAdditionalProperty("type", JsonValue.from("object"))
.putAdditionalProperty(
"properties",
JsonValue.from(
Map.of("location", Map.of("type", "string"))))
.putAdditionalProperty(
"required", JsonValue.from(List.of("location")))
.putAdditionalProperty(
"additionalProperties", JsonValue.from(false))
.build())
.build())
.build());
System.out.println(count.inputTokens());
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24require "openai"
client = OpenAI::Client.new
count = client.responses.input_tokens.count(
model: "gpt-6-astra",
input: "What is the weather in San Francisco?",
tools: [
{
type: :function,
name: "get_weather",
description: "Get the current weather in a location",
strict: true,
parameters: {
type: "object",
properties: { location: { type: "string" } },
required: ["location"],
additionalProperties: false
}
}
]
)
puts(count.input_tokens)
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17curl https://api.openai.com/v1/responses/input_tokens \
-H "Authorization: Bearer $OPENAI_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "gpt-6-astra",
"tools": [{
"type": "function",
"name": "get_weather",
"description": "Get the current weather in a location",
"parameters": {
"type": "object",
"properties": {"location": {"type": "string"}},
"required": ["location"]
}
}],
"input": "What is the weather in San Francisco?"
}'
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17openai responses:input-tokens count \
--raw-output \
--transform input_tokens <<'YAML'
model: gpt-6-astra
tools:
- type: function
name: get_weather
description: Get the current weather in a location
parameters:
type: object
properties:
location:
type: string
required:
- location
input: What is the weather in San Francisco?
YAML
Se admiten archivos de entrada (actualmente, archivos PDF). Envía file_id, file_url o file_data como lo harías para responses.create. El conteo de tokens refleja la totalidad de la entrada procesada del modelo.
El uso de tokens de salida reportado incluye todos los tokens generados por el modelo, no solo el texto visible en una respuesta. La API Responses reporta este total como output_tokens, mientras que la API para completar chats lo reporta como completion_tokens.
Algunos modelos, incluidos los modelos GPT-5, generan tokens que se usan para dar formato o delimitar los canales de respuesta, las llamadas a herramientas y otros elementos de la estructura del mensaje. Estos tokens de formato no aparecen en el contenido del mensaje ni en logprobs, y no necesariamente se desglosan por separado en los datos de uso. Por eso, el conteo reportado de tokens de salida o de completado puede ser mayor que la cantidad de tokens visibles o de tokens incluidos en logprobs, incluso cuando el valor reportado de reasoning_tokens es 0.
Los parámetros max_output_tokens y max_completion_tokens limitan todos los tokens generados por el modelo, incluidos los tokens no visibles. La cantidad de tokens no visibles varía según el modelo y la estructura de la respuesta, así que no supongas que hay una diferencia fija entre el uso reportado y la salida visible. Deja un margen en estos límites cuando necesites una cantidad específica de salida visible.
Para conocer todos los parámetros y la estructura de la respuesta, consulta la referencia de la API para contar tokens de entrada. El punto de acceso es:
POST /v1/responses/input_tokens
La respuesta incluye input_tokens (entero) y object: "response.input_tokens".