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Claude Opus 4.6 vs GPT-5.1 Codex Max
Comprehensive side-by-side LLM comparison
Claude Opus 4.6 leads with 4.1% higher average benchmark score. Claude Opus 4.6 supports multimodal inputs. Claude Opus 4.6 is available on 3 providers. Both models have their strengths depending on your specific coding needs.
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Anthropic
Claude Opus 4.6, released by Anthropic in February 2026, is a large language model from the Claude 4 family designed for complex agent orchestration, extended reasoning, and long-form code generation. It features a 200K token context window (extendable to 1M tokens in beta), 128K maximum output tokens, native image understanding, and extended thinking with both standard and adaptive effort modes. Opus 4.6 targets multi-step agentic workflows, parallel tool use, and applications requiring sustained reasoning over large contexts.
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OpenAI
GPT-5.1 Codex Max, released by OpenAI in November 2025, is an enhanced coding variant from the GPT-5.1 Codex line, designed for more complex software engineering tasks requiring additional reasoning depth. It targets large-scale code generation, automated refactoring, and sophisticated agentic development workflows.
3 months newer
GPT-5.1 Codex Max
OpenAI
2025-11
Claude Opus 4.6
Anthropic
2026-02
Performance Metrics
Context window and performance specifications
Average performance across 2 common benchmarks
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Claude Opus 4.6
Average Score:58.6%(+4.1%)
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GPT-5.1 Codex Max
Average Score:54.4%
Performance comparison across key benchmark categories
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Claude Opus 4.6
Coding58.6%(+4.1%)
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GPT-5.1 Codex Max
Coding54.4%
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Knowledge Cutoff
Training data recency comparison
Claude Opus 4.6
2025-05
More recent knowledge cutoff means awareness of newer technologies and frameworks
Provider Availability & Performance
Available providers and their performance metrics
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Claude Opus 4.6
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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GPT-5.1 Codex Max
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Claude Opus 4.6
Avg Score:58.6%(+4.1%)
Providers:3
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GPT-5.1 Codex Max
Avg Score:54.4%
Providers:0