GPT-5.1-codex-max
GPT-5.1-codex-max is a text model from 
OpenRouter with a context window of 400K tokens and max output of 128K tokens. Pricing starts at 1.25 per million input tokens and 10.00 per million output tokens (cheapest at Azure OpenAI).
Capabilities
✓ Vision✓ Function Calling✓ Reasoning✗ JSON Schema✗ System Messages✗ Web Search✓ Prompt Caching✗ Audio Input✗ Audio Output
Specifications
| Model Key | openrouter/openai/gpt-5.1-codex-max |
| Provider | OpenRouter |
| Provider ID | openrouter |
| Mode | Text |
| Canonical Name | gpt-5.1-codex-max |
| Context Window | 400K tokens |
| Max Output | 128K tokens |
Pricing
| Type | Per 1K Tokens | Per 1M Tokens |
|---|---|---|
| Input Tokens | 0.0013 | 1.25 |
| Output Tokens | 0.010 | 10.00 |
| Cache Read (Input) | 0.000125 | 0.125 |
Benchmarks
No benchmark data is available for this model.
Price Comparison by Provider
Compare prices for GPT-5.1-codex-max across different providers. The same model may be available through multiple providers at different price points.
Provider | Model Key | Input Price, $ | Output Price, $ |
|---|---|---|---|
| OpenRouter | openrouter/openai/gpt-5.1-codex-max | 1.25 | 10.00 |
 OpenAI | gpt-5.1-codex-max | 1.25 | 10.00 |
 GitHub Copilot | github_copilot/gpt-5.1-codex-max | N/A | N/A |
 ChatGPT | chatgpt/gpt-5.1-codex-max | N/A | N/A |
 Azure OpenAI | azure/gpt-5.1-codex-max | 1.25 | 10.00 |
All Variants
All available versions, regions, and API endpoints for GPT-5.1-codex-max.
Model Key | Provider | Mode | Input Price, $ | Output Price, $ | Context | Max Output | Vision | Functions |
|---|---|---|---|---|---|---|---|---|
| azure/gpt-5.1-codex-max | Azure OpenAI | Other | 1.25 | 10.00 | 272K | 128K | yes | yes |
| chatgpt/gpt-5.1-codex-max | ChatGPT | Other | N/A | N/A | 128K | 128K | yes | yes |
| github_copilot/gpt-5.1-codex-max | GitHub Copilot | Other | N/A | N/A | 128K | 128K | yes | yes |
| gpt-5.1-codex-max | OpenAI | Other | 1.25 | 10.00 | 272K | 128K | yes | yes |
| openrouter/openai/gpt-5.1-codex-max | OpenRouter | Text | 1.25 | 10.00 | 400K | 128K | yes | yes |