OpenAIGPT 5.5 Codex
GPT 5.5 Codex is an OpenAI proprietary model. It is not yet ranked: 1 independent result so far, and the index needs at least five across two categories. Last measured 28 Sept 2026.
- Blended price
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- Output speed
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- First answer
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- Context
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- Full answer
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- Cost per run
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- Released
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- date not published by our sources
- Agents & tools46
Versions
OpenAI has shipped 5 models under this name. Each is ranked on its own results; a newer version often has fewer results so far, which holds its index nearer the average until more arrive.
| Model | Released | Index | Rank |
|---|---|---|---|
| GPT-5.3-Codexxhigh | 5 Feb 2026 | 63.8 | #60 |
| GPT-5.2-Codexxhigh | 18 Dec 2025 | 59.4 | #133 |
| GPT-5.1-Codexhigh | 12 Nov 2025 | 56.3 | #209 |
| GPT-5-Codexhigh | 15 Sept 2025 | 57.5 | #177 |
| GPT 5.5 Codexthis page | – | – | – |
Benchmark results
See all LLM benchmarks. One column per reasoning effort. Rank is among every configuration of every model on that benchmark. Hover a score for the run it came from.
Coding
| Benchmark | not stated | Source |
|---|---|---|
| SWE-bench (Vals)not in index | 76.4%#35 | Vals AI |
| Vibe Code Bench v1.1not in index | 58.2%#55 | Vals AI |
Agents & tools
| Benchmark | not stated | Source |
|---|---|---|
| Terminal-Bench 2.1 (Vals) | 57.3%#43 | Vals AI |
| SkillsBenchnot in index | 62.6%#4 | Vals AI |
More from OpenAI
See also
Questions people ask
- Why does GPT 5.5 Codex have no BenchLeader Index score?
- The index needs at least five independent results across at least two categories; as of 25 Oct 2026 GPT 5.5 Codex has 1 that count. Launch-post scores are never used, so it is ranked once independent publishers have measured it.
Data as of 25 Oct 2026. Compare with another model.
Cite as: BenchLeader, “GPT 5.5 Codex: benchmarks, pricing, speed and rank”, data as of 25 Oct 2026, https://www.benchleader.com/models/gpt-5-5-codex.