Model Comparison

Claude Opus 4.6 vs GPT-5.1 Codex MiniWhich is better in 2026?

Claude Opus 4.6 significantly outperforms across most benchmarks. GPT-5.1 Codex Mini is 14.5x cheaper per token.

Verdict: Claude Opus 4.6 vs GPT-5.1 Codex Mini — which is better?

Claude Opus 4.6 (by Anthropic) and GPT-5.1 Codex Mini (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Claude Opus 4.6 outperforms in 1 benchmarks (AIME 2025), while GPT-5.1 Codex Mini is better at 0 benchmarks. Claude Opus 4.6 significantly outperforms across most benchmarks.

On price, GPT-5.1 Codex Mini is roughly 14.5x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

Claude Opus 4.6 also accepts a larger context window (1,000,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose Claude Opus 4.6 if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you process long inputs — it offers a 1,000,000 token context window
  • you want the most recent training data — it shipped Feb 2026

Choose GPT-5.1 Codex Mini if…

  • cost matters — it's about 14.5x cheaper per token

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Claude Opus 4.6 outperforms in 1 benchmarks (AIME 2025), while GPT-5.1 Codex Mini is better at 0 benchmarks.

Claude Opus 4.6 significantly outperforms across most benchmarks.

Fri Jun 26 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT-5.1 Codex Mini costs less

For input processing, Claude Opus 4.6 ($5.00/1M tokens) is 20.0x more expensive than GPT-5.1 Codex Mini ($0.25/1M tokens).

For output processing, Claude Opus 4.6 ($25.00/1M tokens) is 12.5x more expensive than GPT-5.1 Codex Mini ($2.00/1M tokens).

In conclusion, Claude Opus 4.6 is more expensive than GPT-5.1 Codex Mini.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Fri Jun 26 2026 • llm-stats.com
Anthropic
Claude Opus 4.6
Input tokens$5.00
Output tokens$25.00
Best providerAnthropic
OpenAI
GPT-5.1 Codex Mini
Input tokens$0.25
Output tokens$2.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Claude Opus 4.6 accepts 1,000,000 input tokens compared to GPT-5.1 Codex Mini's 400,000 tokens. Both models can generate responses up to 128,000 tokens.

Anthropic
Claude Opus 4.6
Input1,000,000 tokens
Output128,000 tokens
OpenAI
GPT-5.1 Codex Mini
Input400,000 tokens
Output128,000 tokens
Fri Jun 26 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Opus 4.6 and GPT-5.1 Codex Mini support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude Opus 4.6

Text
Images
Audio
Video

GPT-5.1 Codex Mini

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.

Claude Opus 4.6

Proprietary

Closed source

GPT-5.1 Codex Mini

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 4.6 was released on 2026-02-05, while GPT-5.1 Codex Mini was released on 2025-11-12.

Claude Opus 4.6 is 3 months newer than GPT-5.1 Codex Mini.

Claude Opus 4.6

Feb 5, 2026

4 months ago

2mo newer
GPT-5.1 Codex Mini

Nov 12, 2025

7 months ago

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

Provider Availability

Claude Opus 4.6 is available from Anthropic. GPT-5.1 Codex Mini is available from OpenAI.

Claude Opus 4.6

anthropic logo
Anthropic
Input Price:Input: $5.00/1MOutput Price:Output: $25.00/1M

GPT-5.1 Codex Mini

openai logo
OpenAI
Input Price:Input: $0.25/1MOutput Price:Output: $2.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Anthropic
Larger context window (1,000,000 tokens)
Higher AIME 2025 score (99.8% vs 42.1%)
OpenAI
Less expensive input tokens
Less expensive output tokens

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Claude Opus 4.6 and GPT-5.1 Codex Mini side-by-side, then vote on the output you prefer.

Claude Opus 4.6
✓ Preferred
GPT-5.1 Codex Mini
Open in Playground
AI Model Comparison Table
Feature
Anthropic
Claude Opus 4.6
OpenAI
GPT-5.1 Codex Mini

FAQ

Common questions about Claude Opus 4.6 vs GPT-5.1 Codex Mini.

Which is better, Claude Opus 4.6 or GPT-5.1 Codex Mini?

Claude Opus 4.6 significantly outperforms across most benchmarks. Claude Opus 4.6 is made by Anthropic and GPT-5.1 Codex Mini is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Opus 4.6 compare to GPT-5.1 Codex Mini in benchmarks?

Claude Opus 4.6 scores Vending-Bench 2: 100.0%, AIME 2025: 99.8%, Tau2 Telecom: 99.3%, Graphwalks parents >128k: 95.4%, Tau2 Retail: 91.9%. GPT-5.1 Codex Mini scores AIME 2025: 42.1%.

Is Claude Opus 4.6 cheaper than GPT-5.1 Codex Mini?

GPT-5.1 Codex Mini is 20.0x cheaper for input tokens. Claude Opus 4.6 costs $5.00/M input and $25.00/M output via anthropic. GPT-5.1 Codex Mini costs $0.25/M input and $2.00/M output via openai.

What are the context window sizes for Claude Opus 4.6 and GPT-5.1 Codex Mini?

Claude Opus 4.6 supports 1.0M tokens and GPT-5.1 Codex Mini supports 400K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude Opus 4.6 and GPT-5.1 Codex Mini?

Key differences include context window (1.0M vs 400K), input pricing ($5.00 vs $0.25/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Opus 4.6 and GPT-5.1 Codex Mini?

Claude Opus 4.6 is developed by Anthropic and GPT-5.1 Codex Mini is developed by OpenAI.

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