GPT-5.1 Codex API Benchmarks, Pricing & Provider Data
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GPT-5.1 Codex benchmark, API pricing, and provider data cover 379 API providers, with prices starting at $0.0041/request. GPT-5.1 Codex free API options are available from 2 providers.
OpenAI GPT-5.1 Codex is a code-specialized variant in the GPT-5 series, optimized for code generation, debugging, and software development tasks.
Category Performance
Observed-capability estimates with uncertainty reported separately from independent benchmark families.
- Coverage
- 6 / 8
- Methodology
- V3.0
#1Reasoning55.3RatedGlobal rank #163/4 Measured dimensions
#2Math54.1Provisional1/4 Measured dimensions
#3Instruction following52.5Provisional1/4 Measured dimensions
#4Coding50.6Estimated2/4 Measured dimensions
#5Knowledge50Provisional1/4 Measured dimensions
#6Agents49.7Estimated3/4 Measured dimensions
Specifications
Input and output token limits for this model, plus how it ranks on long-context understanding.
Features
Rankings
Excels at
It's decent at
Falls behind in
Detailed scores
Updated: Sep 1, 2026Pricing
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Input price$1.25/M#120 / 181Output price$10.00/M#139 / 181
Pricing
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Agents
V3.0undefined metric} other undefined metrics}} · Estimated
Score49.780% interval40.4–59.03/4 Measured dimensionsΤ²-bench results83.0#51 / 82Gert Labs49.7#23 / 49
Agents
V3.0undefined metric} other undefined metrics}} · Estimated
Coding
V3.0undefined metric} other undefined metrics}} · Estimated
Score50.680% interval39.4–61.82/4 Measured dimensionsLiveCodeBench84.9%#9 / 115SciCode40.2%#84 / 206
Coding
V3.0undefined metric} other undefined metrics}} · Estimated
Reasoning
V3.0undefined metric} other undefined metrics}} · Rated
Score55.3#1680% interval46.7–64.03/4 Measured dimensionsMMLU-Pro86.0%#23 / 129GPQA86.0%#57 / 213
Reasoning
V3.0undefined metric} other undefined metrics}} · Rated
Knowledge
V3.0undefined metric} other undefined metrics}} · Provisional
Score5080% interval34.0–66.01/4 Measured dimensionsArtificial Analysis Intelligence Index35.6#57 / 111AA-GPQA Diamond86.0#49 / 108
Knowledge
V3.0undefined metric} other undefined metrics}} · Provisional
Math
V3.0undefined metric} other undefined metrics}} · Provisional
Score54.180% interval38.0–70.31/4 Measured dimensions
Math
V3.0undefined metric} other undefined metrics}} · Provisional
Multilingual
V3.0undefined metric} other undefined metrics}} · No data
No data80% interval30.8–69.20/4 Measured dimensions
Multilingual
V3.0undefined metric} other undefined metrics}} · No data
Multimodal
V3.0undefined metric} other undefined metrics}} · No data
80% interval30.8–69.20/4 Measured dimensionsAA-MMMU-Pro72.5#43 / 65Design Arena Website1183.0#53 / 75
Multimodal
V3.0undefined metric} other undefined metrics}} · No data
Instruction following
V3.0undefined metric} other undefined metrics}} · Provisional
Score52.580% interval36.5–68.51/4 Measured dimensionsAA-IFBench70.0#37 / 84
Instruction following
V3.0undefined metric} other undefined metrics}} · Provisional
OpenRouter endpoints
1 endpointsThird-party OpenRouter endpoint data, shown separately from LMSpeed measurements. Some 30-minute live performance fields only appear after syncing with an OpenRouter API key.
| Provider endpoint | Input | Output | 1d uptime | 30m latency | 30m throughput | Context / output |
|---|---|---|---|---|---|---|
Azure azure | $1.25/M | $10/M | 100% | — | — | undefined tokens / undefined tokens |
Pricing Comparison
Compare GPT-5.1 Codex API pricing across 377 providers. Prices range from $0.0041/request to $495.00/M. Yun API offers the lowest rate at $0.0041/request. 2 providers offer free API credits or a free tier.
| Provider | Health | Model Variant | Group | Input ($/M) | Output ($/M) | Speed (t/s) | First token | Audit |
|---|---|---|---|---|---|---|---|---|
L1 100% | gpt-5.1-codex | default | -93%$0.086/M Cache read$0.0086/M | -93%$0.685/M | — | — | — | |
L1 100% | gpt-5.1-codex-high | CodeX_05_token | $0.0068/request | - | — | — | — | |
L1 100% | gpt-5.1-codex | default | $0.014/request | - | — | — | — | |
L1 100% | gpt-5.1-codex-medium | CodeX_05_token | $0.0068/request | - | — | — | — | |
L1 100% | gpt-5.1-codex-2025-11-13 | default | -86%$0.171/M | -86%$1.37/M | — | — | — | |
L1 100% | gpt-5.1-codex | default | -86%$0.171/M Cache read$0.017/M | -86%$1.37/M | — | — | — | |
L1 100% | gpt-5.1-codex | default | -23%$0.959/M | -23%$7.67/M | — | — | — | |
L1 100% | gpt-5.1-codex | default | $1.25/M | $10.00/M | — | — | — | |
L1 100% | gpt-5.1-codex-2025-11-13 | default | $75.00/M | $600.00/M | — | — | — | |
兔子API Free | L1 100% | gpt-5.1-codex | 官方优惠 | Free | Free | — | — | — |
L1 100% | gpt-5.1-codex | gpt-azure | $1.25/M | -37%$6.25/M | — | — | — | |
L1 100% | gpt-5.1-codex-2025-11-13 | gpt-azure | $1.25/M Cache read$0.125/M | $10.00/M | — | — | — | |
L1 100% | gpt-5.1-codex | default | -93%$0.086/M Cache read$0.0086/M | -93%$0.685/M | — | — | — | |
L1 100% | gpt-5.1-codex | default | -96%$0.051/M Cache read$0.0051/M | -96%$0.411/M | — | — | — | |
L1 100% | gpt-5.1-codex-2025-11-13 | default | -96%$0.051/M | -96%$0.411/M | — | — | — | |
L1 100% | gpt-5.1-codex | official | $1.25/M Cache read$0.125/M | $10.00/M | — | — | — | |
L1 99% | gpt-5.1-codex-2025-11-13 | az | -79%$0.257/M | -79%$2.05/M | — | — | — | |
L1 99% | gpt-5.1-codex | az | -79%$0.257/M Cache read$0.026/MCache write$0.321/MCache write 1h$0.514/M | -79%$2.05/M | — | — | — | |
L1 99% | gpt-5.1-codex-high | gpt-vip | -52%$0.599/M Cache read$0.060/MCache write$0.749/MCache write 1h$1.20/M | -52%$4.79/M | — | — | — | |
L1 99% | gpt-5.1-codex-medium | gpt-vip | -52%$0.599/M Cache read$0.060/MCache write$0.749/MCache write 1h$1.20/M | -52%$4.79/M | — | — | — |
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Frequently Asked Questions
- What benchmark data does GPT-5.1 Codex include?
- LMSpeed shows GPT-5.1 Codex benchmark context, API price, output speed, first-token latency, and provider data across 379 providers when those signals are available.
- What is the GPT-5.1 Codex API price?
- GPT-5.1 Codex has pricing from 379 providers, ranging from $0.0041/request to $495.00/M. Yun API has the lowest listed price.
- What does the GPT-5.1 Codex API pricing table include?
- The GPT-5.1 Codex API pricing table compares 379 providers by input price, output price, free tier status, speed, first-token latency, and recent health data when available.
- Which provider has the cheapest GPT-5.1 Codex API pricing?
- Yun API currently has the lowest listed GPT-5.1 Codex price at $0.0041/request across 379 providers.
- Is GPT-5.1 Codex API free?
- Yes, GPT-5.1 Codex free API options are available through 2 providerundefined other undefined} on LMSpeed, including 兔子API, 兔子API. These providers offer free API credits or a free tier with no per-token charges.
- Where can I get GPT-5.1 Codex free API access?
- LMSpeed currently lists 2 free API providerundefined other undefined} for GPT-5.1 Codex: 兔子API, 兔子API. Check each provider row before using it because free tier limits can change.