Compare models
GPT-6 Astra
Our most capable model, built for the hardest end-to-end work
Reasoning
Speed
Input
Output
Reasoning tokens
Pricing
Per 1M tokens
Input
$10.00
Cached input
$1.00
Output
$50.00
Context
Window
1,050,000
Max Output Tokens
128,000
Knowledge Cutoff
Apr 30, 2026
Endpoints
v1/chat/completions
v1/responses
v1/batch
Supported Features
Streaming
Function calling
Structured outputs
Image input
Rate Limits
TPM
Free
-
Tier 1
500,000
Tier 2
1,000,000
Tier 3
2,000,000
Tier 4
4,000,000
Tier 5
40,000,000
GPT-5.6 Sol
Flagship model for complex professional work
Reasoning
Speed
Input
Output
Reasoning tokens
Pricing
Per 1M tokens
Input
$4.00
Cached input
$0.40
Output
$20.00
Context
Window
1,050,000
Max Output Tokens
128,000
Knowledge Cutoff
Feb 16, 2026
Endpoints
v1/chat/completions
v1/responses
v1/batch
Supported Features
Streaming
Function calling
Structured outputs
Image input
Rate Limits
TPM
Free
-
Tier 1
500,000
Tier 2
1,000,000
Tier 3
2,000,000
Tier 4
4,000,000
Tier 5
40,000,000