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OpenAI: GPT-5.1-Codex-Max vs Anthropic: Claude Opus 4.6

Head-to-head API cost, context, and performance comparison. Synced at 12:08:14 AM.

Executive Summary

When evaluating OpenAI: GPT-5.1-Codex-Max against Anthropic: Claude Opus 4.6, the pricing structure is a key differentiator. OpenAI: GPT-5.1-Codex-Max is approximately 63% more cost-effective per 1 million tokens overall.

However, when looking at raw reasoning capabilities, OpenAI: GPT-5.1-Codex-Max leads with a statistical ELO score of 1506. For tasks involving complex logic, coding, or instruction-following, developers might prefer OpenAI: GPT-5.1-Codex-Max, provided their budget allows for the API burn rate.

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Raw Technical comparison

Metric
OpenAI: GPT-5.1-Codex-Max
Anthropic: Claude Opus 4.6
Performance (ELO)
1506
1500
Input Cost / 1M
$1.25
$5.00
Output Cost / 1M
$10.00
$25.00
Context Window
400,000 tokens
1,000,000 tokens

Verdict

If you are looking for pure performance and capability, OpenAI: GPT-5.1-Codex-Max is statistically superior. However, if API burn rate is the primary concern, OpenAI: GPT-5.1-Codex-Max wins out aggressively in pricing.

People Also Ask

Is OpenAI: GPT-5.1-Codex-Max cheaper than Anthropic: Claude Opus 4.6?

Yes. OpenAI: GPT-5.1-Codex-Max is cheaper for both input and output generation compared to Anthropic: Claude Opus 4.6. Exploring alternatives often yields cost reductions.

Which model has the larger context window?

The Anthropic: Claude Opus 4.6 model has the advantage in memory, offering a massive 1,000,000 token limit for document ingestion.

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