GPT-5.1-Codex
OpenAI · Multimodal · Released Nov 2025
A coding-specialized model from OpenAI's GPT-5.1 generation with a 400k token context window.
- Strengths
- Handles software engineering tasks with strong code generation, debugging, and technical reasoning capabilities.
- Best for
- Development workflows that require reading large codebases, implementing complex features, and analyzing code architecture across an extended context.
- Limitations
- Newer coding models like GPT-5.1-Codex-Max offer improved capabilities, and the December 2025 GPT-5.2 generation provides general reasoning advances that may benefit some engineering tasks.
Input / 1M
$1.25
Output / 1M
$10.00
Cached input / 1M
$0.13
Context window
400K
Price history
Input (solid)Output (dashed)
Price change
- 30d
- in — out —
- 90d
- in decreased 0.0% out decreased 0.0%
- 1y
- in decreased 0.0% out decreased 0.0%
- Since launch
- in decreased 0.0% out decreased 0.0%
Snapshots
| Effective | Input | Output | Cached in | Note | Source |
|---|---|---|---|---|---|
| 26 Jul 2026 | $1.25 | $10.00 | $0.13 | Imported from OpenRouter | openrouter.ai |
| 15 Jul 2026 | $1.25 | $10.00 | $0.125 | Imported from OpenRouter | openrouter.ai |
| 11 Jun 2026 | $1.25 | $10.00 | $0.13 | Imported from OpenRouter | openrouter.ai |