# OpenAI GPT-5.1-Codex-Max

OpenAI GPT-5.1-Codex-Max costs $1.25 per million input tokens and $10.00 per million output tokens, as of October 22, 2026. Only one of the 6 coding benchmarks behind the index has measured it, and the index needs two, so there is not enough data for a coding score. 5 benchmarks outside the index have a result below.

Page: https://llmbenchmark.ai/models/gpt-5-1-codex-max
Data from October 22, 2026. Every figure below names the board it was read from and the day.

- Maker: OpenAI
- Released: December 4, 2025
- Price per million input tokens: $1.25
- Price per million output tokens: $10.00
- Context window: 400K tokens
- Vibe Coding Index: not enough data (one index benchmark; at least two are needed to rank)

Benchmark results (6 of 206):

- LiveCodeBench (Vals AI): 83.6% (source: Vals AI boards, read October 22, 2026)
- Vibe Code Bench (Vals AI): 22.2% (OpenHands) (source: Vals AI boards, read October 22, 2026)
- Terminal-Bench: 60.4% (source: Epoch AI benchmarking hub, read October 22, 2026)
- METR time horizons: 70.8% (source: Epoch AI benchmarking hub, read October 22, 2026)
- ProofBench: 9.0% (source: Epoch AI benchmarking hub, read October 22, 2026)
- ALE-Bench: 1228.3 (xHigh) (source: ALE-Bench (Sakana AI), read October 22, 2026)