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Claude Sonnet 4 vs GPT-5.1 Codex Max
Comprehensive side-by-side LLM comparison
Claude Sonnet 4 supports multimodal inputs. Claude Sonnet 4 is available on 3 providers. Both models have their strengths depending on your specific coding needs.
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Anthropic
Claude Sonnet 4, released by Anthropic in May 2025, is a large language model from the Claude 4 family that delivers a balance of performance and efficiency for coding, reasoning, and analytical tasks. It features a 200K token context window (extendable to 1M tokens in beta), 64K maximum output tokens, native image understanding, and extended thinking support. Sonnet 4 targets development workflows, document analysis, and applications that benefit from the performance characteristics of the Claude 4 generation.
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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.
5 months newer
Claude Sonnet 4
Anthropic
2025-05-14
GPT-5.1 Codex Max
OpenAI
2025-11
Performance Metrics
Context window and performance specifications
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Knowledge Cutoff
Training data recency comparison
Claude Sonnet 4
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 Sonnet 4
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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GPT-5.1 Codex Max
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Claude Sonnet 4
Avg Score:0.0%
Providers:3
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GPT-5.1 Codex Max
Avg Score:0.0%
Providers:0