GPT-5.1 Codex Max
openai/gpt-5.1-codex-maxCoding-optimized GPT model for repository edits, reviews, and agentic software work
GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic...
Context
256K
256,000 tokens
Max output
128K
128,000 tokens
Input
$1.25
per 1M tokens
Output
$10.00
per 1M tokens
Providers
13
13 listings
Intelligence
—
Not yet scored
Pricing
USD per 1M tokens · listed by Ofox
| Token type | Standard |
|---|---|
| Input | $1.25 |
| Output | $10.00 |
| Cache read | $0.13 |
Lowest input price across providers: $1.10.
Capabilities
ReasoningYes
Effort: low, medium, high, xhigh
Tool callYes
Structured outputYes
TemperatureNo
AttachmentsYes
Interleaved reasoningYes
Field: reasoning_details
Open weightsNo
ModeratedNo
Input
TextImage
Output
Text
Benchmarks
Published scores and Design Arena Elo
No published benchmark scores for this model yet.
Rankings
Position on each OneAtlas leaderboard
Providers · 13
13 listings
Ofox
NanoGPT
Vercel AI Gateway
Kilo Gateway
Eden AI
AI/ML API
Poe
OpenCode
Abacus
Azure
Azure Cognitive Services
Jiekou.AI
Vivgrid| Provider | Model ID | Context | Input limit | Output | Input $ | Output $ | Reasoning $ | Cache read | Cache write | Audio in | Audio out | Reasoning | Tools | Structured | Temp. | Updated |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Abacus | gpt-5.1-codex-max | 400K | 272K | 128K | $1.25 | $10.00 | — | — | — | — | — | Yes | Yes | Yes | No | Nov 13, 2025 |
| AI/ML API | openai/gpt-5.1-codex-max | 400K | 272K | 128K | $2.65 | $21.16 | — | $0.26 | — | — | — | Yes | Yes | Yes | No | Nov 13, 2025 |
| Azure | gpt-5.1-codex-max | 400K | 272K | 128K | $1.25 | $10.00 | — | $0.13 | — | — | — | Yes | Yes | Yes | No | Nov 13, 2025 |
| Azure Cognitive Services | gpt-5.1-codex-max | 400K | 272K | 128K | $1.25 | $10.00 | — | $0.13 | — | — | — | Yes | Yes | Yes | No | Nov 13, 2025 |
| Eden AI | azure/gpt-5.1-codex-max | 272K | — | 128K | $1.25 | $10.00 | — | $0.13 | — | — | — | Yes | Yes | Yes | No | Nov 13, 2025 |
| Jiekou.AI | gpt-5.1-codex-max | 400K | 272K | 128K | $1.19 | $9.50 | — | $0.12 | — | — | — | Yes | Yes | Yes | No | Nov 13, 2025 |
| Kilo Gateway | openai/gpt-5.1-codex-max | 400K | 272K | 128K | $1.25 | $10.00 | — | $0.13 | — | — | — | Yes | Yes | Yes | No | Nov 13, 2025 |
| NanoGPT | openai/gpt-5.1-codex-max | 400K | 400K | 128K | $2.50 | $20.00 | — | $0.25 | — | — | — | Yes | Yes | Yes | No | Nov 13, 2025 |
| Ofox | openai/gpt-5.1-codex-max | 256K | — | 128K | $1.25 | $10.00 | — | $0.13 | — | — | — | Yes | Yes | Yes | No | Nov 13, 2025 |
| OpenCode | gpt-5.1-codex-max | 400K | 272K | 128K | $1.25 | $10.00 | — | $0.13 | — | — | — | Yes | Yes | Yes | No | Nov 13, 2025 |
| Poe | openai/gpt-5.1-codex-max | 400K | 272K | 128K | $1.10 | $9.00 | — | $0.11 | — | — | — | Yes | Yes | Unknown | No | Nov 13, 2025 |
| Vercel AI Gateway | openai/gpt-5.1-codex-max | 400K | 272K | 128K | $1.25 | $10.00 | — | $0.13 | — | — | — | Yes | Yes | Yes | Yes | Nov 13, 2025 |
| Vivgrid | gpt-5.1-codex-max | 400K | 272K | 128K | $1.25 | $10.00 | — | $0.13 | — | — | — | Yes | Yes | Yes | No | Nov 13, 2025 |