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GPT-5.1 Codex High vs MAI-Thinking-1

GPT-5.1 Codex High and MAI-Thinking-1 are closely matched at 29.3 and 32.8 on the LLM Stats Score.

OpenAI · Microsoft · Updated for 2026

Which is better?

GPT-5.1 Codex High and MAI-Thinking-1 are closely matched on the overall LLM Stats Score at 29.3 and 32.8.

In the 1 individual benchmarks reported for both models, MAI-Thinking-1 wins 1; this is a narrower head-to-head signal than the composite indexes.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose GPT-5.1 Codex High

  • you want predictable pricing at $1.25/M input and $10.00/M output

Choose MAI-Thinking-1

  • you value its reported benchmark strengths — it wins 1 of 1 exact shared results
  • you want the most recent training data — it shipped Jun 2026

At a glance

The differences that matter most.

GPT-5.1 Codex High
OpenAI
MAI-Thinking-1
Microsoft
Core performance indexes
LLM Stats Score
29.3
#152
32.8
#122
Reasoning
29.1
#144
33.6
#112
Cost, coverage & limits
Benchmark wins
0 of 1
1 of 1
Input price
$1.25 / M
— / M
Output price
$10.00 / M
— / M
Context window
400,000
—

Individual benchmarks

1 reported for GPT-5.1 Codex High · 23 for MAI-Thinking-1

1 shared

GPT-5.1 Codex High outperforms in 0 benchmarks, while MAI-Thinking-1 is better at 1 benchmark (AIME 2025).

MAI-Thinking-1 significantly outperforms across most benchmarks.

Tue Oct 20 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only GPT-5.1 Codex High specifies input context (400,000 tokens). Only GPT-5.1 Codex High specifies output context (128,000 tokens).

OpenAI
GPT-5.1 Codex High
Input400,000 tokens
Output128,000 tokens
Microsoft
MAI-Thinking-1
Input- tokens
Output- tokens
Tue Oct 20 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

GPT-5.1 Codex High supports multimodal inputs, whereas MAI-Thinking-1 does not.

GPT-5.1 Codex High can handle both text and other forms of data like images, making it suitable for multimodal applications.

GPT-5.1 Codex High

Text
Images
Audio
Video

MAI-Thinking-1

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

GPT-5.1 Codex High

Proprietary

Closed source

MAI-Thinking-1

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5.1 Codex High was released on 2025-11-12, while MAI-Thinking-1 was released on 2026-06-02.

MAI-Thinking-1 is 7 months newer than GPT-5.1 Codex High.

GPT-5.1 Codex High

Nov 12, 2025

11 months ago

MAI-Thinking-1

Jun 2, 2026

4 months ago

6mo newer

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against GPT-5.1 Codex High and MAI-Thinking-1 side-by-side, then vote on the output you prefer.

GPT-5.1 Codex High
✓ Preferred
MAI-Thinking-1
Open in Playground

FAQ

Common questions about GPT-5.1 Codex High vs MAI-Thinking-1.

Which is better, GPT-5.1 Codex High or MAI-Thinking-1?

GPT-5.1 Codex High and MAI-Thinking-1 are closely matched on the LLM Stats Score at 29.3 and 32.8. GPT-5.1 Codex High is made by OpenAI and MAI-Thinking-1 is made by Microsoft. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does GPT-5.1 Codex High compare to MAI-Thinking-1 in benchmarks?

GPT-5.1 Codex High scores AIME 2025: 96.7%. MAI-Thinking-1 scores LongFact: 98.0%, AIME 2025: 97.0%, AIME 2026: 94.5%, GraphWalks: 90.0%, AIR-Bench: 88.0%.

What are the context window sizes for GPT-5.1 Codex High and MAI-Thinking-1?

GPT-5.1 Codex High supports 400K tokens and MAI-Thinking-1 supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-5.1 Codex High and MAI-Thinking-1?

Key differences include LLM Stats Score (29.3 vs 32.8), multimodal support (yes vs no). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-5.1 Codex High and MAI-Thinking-1?

GPT-5.1 Codex High is developed by OpenAI and MAI-Thinking-1 is developed by Microsoft.

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