OpenAI › GPT-5.1 Codex › Pricing
$1.25 / $10per 1M tokens in / out
#355on OpenRouter by tokens · 727M / week
Price sheetper 1M tokens
| Input | $1.25 | Azure |
| Output | $10 | |
| Context · max output | 400K · 128K | tokens |
Where to buy1 provider · per 1M tokens
| Provider | Input | Output | Context |
|---|---|---|---|
| Azure | $1.25 | $10 | — |
In OpenAI's line-upper 1M in / out
| GPT-6 Luna Decisions | $0.10 / — | −100% |
| GPT OSS 20B | $0.018 / $0.09 | −99% |
| GPT OSS 120B | $0.03 / $0.15 | −98% |
| GPT OSS Safeguard 20B | $0.07 / $0.20 | −97% |
| GPT-6 Luna | $0.10 / $0.50 | −94% |
| GPT OSS Safeguard 120B | $0.15 / $0.60 | −92% |
| GPT-5.4 Nano (2026-03-17) | $0.20 / $1.25 | −87% |
Cheaper for the same workvs GPT-5.1 Codex at high
| Muse Spark 1.3 max | -42% | score ×2 | $1.60 |
| Grok 4.7 xhigh | -13% | score +96% | $3.74 |
| MiMo v2.6 Pro thinkingOpen | -84% | score +95% | $0.13 |
| Qwen3.8 Max (0902) thinking | -13% | score +92% | $5.41 |
| DeepSeek V4.1 Flash 1017 maxOpen | -85% | score +90% | $0.26 |
Pricing questions
How much does GPT-5.1 Codex cost?›
$1.25 per 1M input tokens and $10 per 1M output tokens.
Is GPT-5.1 Codex free to use?›
There is no free API tier.
What is a cheaper alternative to GPT-5.1 Codex?›
Muse Spark 1.3 at max effort costs -42% per task with a score ×2 on .