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Claude Opus 4.1 vs GPT-5.1 Codex
Comprehensive side-by-side LLM comparison
Both models show comparable benchmark performance. Claude Opus 4.1 supports multimodal inputs. Claude Opus 4.1 is available on 3 providers. Both models have their strengths depending on your specific coding needs.
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Anthropic
Claude Opus 4.1, released by Anthropic in August 2025, is a large language model from the Claude 4 family optimized for demanding reasoning, multi-step coding, and extended analysis tasks. It features a 200K token context window, 32K maximum output tokens, native image understanding, and extended thinking capabilities. Opus 4.1 targets complex problem-solving, multi-turn reasoning workflows, and applications requiring deep analysis with integrated tool use.
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OpenAI
GPT-5.1 Codex, released by OpenAI in November 2025, is a coding-specialized model from the GPT-5.1 family engineered for software engineering tasks including code generation, multi-file editing, and agentic development. It targets developers and automated coding pipelines requiring a GPT-5.1-generation model tuned for programming.
2 months newer
Claude Opus 4.1
Anthropic
2025-08-05
GPT-5.1 Codex
OpenAI
2025-11
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude Opus 4.1
Average Score:74.5%(+0.8%)
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GPT-5.1 Codex
Average Score:73.7%
Performance comparison across key benchmark categories
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Claude Opus 4.1
Coding74.5%(+0.8%)
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GPT-5.1 Codex
Coding73.7%
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Knowledge Cutoff
Training data recency comparison
Claude Opus 4.1
2025-01
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 4.1
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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GPT-5.1 Codex
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Claude Opus 4.1
Avg Score:74.5%(+0.8%)
Providers:3
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GPT-5.1 Codex
Avg Score:73.7%
Providers:0