Gemini 4 Argon
Claude Opus 5.5
Muse Wonder
MiMo-V2.6-Pro
Qwen3.8-Max
Kimi K3
GLM-5.3
ERNIE 5.1
DeepSeek-V4.1-Flash-20260910
Grok 4.20 Beta
amazon-nova-experimental-chat
Dola Seed 2.0 Pro
NVIDIA-Nemotron-3-Ultra-550B-A55B
Gemma 4 31B
Step 5 Preview
GPT 5 Codex
GPT 5 Codex is a proprietary model from OpenAI. Its best result is #37 of 143 on LiveCodeBench with 84.72%.
- Developer
- OpenAI
- Released
- —
- Context window
- —
- Price in / out, per 1M tokens
- —
- Weights
- Proprietary
- Inputs
- —
- Reasoning
- —
- Tool use
- —
Benchmarks
| Benchmark | Score bar | Accuracy | Rank | Cost / test |
|---|---|---|---|---|
| LiveCodeBenchCoding | 84.72% | 37 / 143 | $1.25 / $10 |
Vals AI, as of Oct 24, 2026.
Compare GPT 5 Codex
OpenAI
The lab behind GPT and ChatGPT, which brought large language models to hundreds of millions of people. Founded 2015, based in San Francisco. openai.com
Questions
Who makes GPT 5 Codex?
GPT 5 Codex is made by OpenAI, founded 2015 and based in San Francisco.
Is GPT 5 Codex open source?
No. GPT 5 Codex is proprietary and served through its provider’s API.