OpenAI, proprietary
GPT-5.1-Codex-mini
GPT-5.1-Codex-mini by OpenAI has 2 published benchmark results on Noometry, not yet enough to be ranked. API pricing starts at $0.25 per million input tokens and $2 per million output tokens, with a 400K-token context window.
Last verified
Specifications
- Noometry rank
- Unranked
- Index score
- Not ranked
- Evidence
- Sparse 2 results
- Provider
- OpenAI
- Released
- November 12, 2025
- Weights
- Proprietary
- Reasoning
- Yes
- Context window
- 400K
- Max output
- 128K
- Input price
- $0.25 / M
- Output price
- $2 / M
- Blended price
- $0.69 / M
- Output speed
- Not measured
- Value
- Not ranked
- Knowledge cutoff
- September 2024
- Input
- text, image
Category scores
Each category score combines every public result we have in that category.
- Coding 31.6
- Agentic & Tool Use 38.5
| Category | Score | Rank | Results |
|---|---|---|---|
| Coding | 31.6 | — | 1 |
| Agentic & Tool Use | 38.5 | — | 1 |
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Benchmark results
Every published result we track, with its source. Bold rows are the ones used for ranking; where several exist we prefer independent runs over self-reported numbers.
Coding
| Benchmark | Score | Position | Setting | Source | Date |
|---|---|---|---|---|---|
| LMArena WebDev | 1244 | #102 of 113, top 91% | LMArena | 2026-10-08 |
Agentic & Tool Use
| Benchmark | Score | Position | Setting | Source | Date |
|---|---|---|---|---|---|
| Terminal-Bench | 61.6% | #12 of 41, top 30% | Epoch AI |
API pricing by provider
| Route | Input $/M | Output $/M | Cached input $/M | Checked |
|---|---|---|---|---|
| azure | $0.25 | $2 | $0.025 | 2026-10-10 |
| openrouter | $0.25 | $2 | $0.03 | 2026-10-10 |
Compare GPT-5.1-Codex-mini
- GPT-5.1-Codex-mini vs GPT-6 Astra
- GPT-5.1-Codex-mini vs Claude Fable 5.1
- GPT-5.1-Codex-mini vs Claude Opus 5.5
- GPT-5.1-Codex-mini vs Claude Opus 5
- GPT-5.1-Codex-mini vs Claude Fable 5
- GPT-5.1-Codex-mini vs GPT-6.1 Sol
- GPT-5.1-Codex-mini vs Gemini 3.8 Flash
- GPT-5.1-Codex-mini vs Kimi K3
- GPT-5.1-Codex-mini vs Grok 4.6
- GPT-5.1-Codex-mini vs Qwen3.8 Max
- GPT-5.1-Codex-mini vs GLM-5.3
- GPT-5.1-Codex-mini vs Muse Spark 1.3
- GPT-5.1-Codex-mini vs DeepSeek V4 Pro
- GPT-5.1-Codex-mini vs MiMo-V2.6-Pro
Other OpenAI models
- GPT-6 Astra70.8
- GPT-6.1 Sol65.6
- GPT-5.6 Sol65.0
- GPT-5.5 Pro64.3
- GPT-5.563.4
- GPT-6 Sol61.8
- GPT-5.459.4
- GPT-5.6 Terra59.2
Frequently asked questions
How good is GPT-5.1-Codex-mini?
GPT-5.1-Codex-mini by OpenAI has 2 published benchmark results on Noometry, not yet enough to be ranked. API pricing starts at $0.25 per million input tokens and $2 per million output tokens, with a 400K-token context window.
How much does GPT-5.1-Codex-mini cost?
GPT-5.1-Codex-mini costs $0.25 per million input tokens and $2 per million output tokens on azure, with cached input at $0.025.
What is GPT-5.1-Codex-mini's context window?
GPT-5.1-Codex-mini accepts up to 400K tokens of input and can write up to 128K tokens in one response.
Is GPT-5.1-Codex-mini open source?
No. GPT-5.1-Codex-mini is proprietary and available only through OpenAI's API and partner platforms.