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Claude 3.5 Sonnet vs GPT-5 Codex
Comprehensive side-by-side LLM comparison
Claude 3.5 Sonnet supports multimodal inputs. Claude 3.5 Sonnet is available on 3 providers. Both models have their strengths depending on your specific coding needs.
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Anthropic
Claude 3.5 Sonnet, updated by Anthropic in October 2024 (originally released June 2024), is a large language model from the Claude 3.5 family that delivered strong performance in coding, reasoning, and instruction-following at its release. It supports a 200K token context window, 8K maximum output tokens, and native image understanding including screenshot analysis and document comprehension. Claude 3.5 Sonnet targets general-purpose development tasks, document analysis, and applications requiring reliable instruction following with visual input support.
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OpenAI
GPT-5 Codex, released by OpenAI in August 2025, is a coding-specialized large language model from the GPT-5 family engineered for software engineering, code generation, and agentic development workflows. It builds on GPT-5's architecture with optimizations targeting multi-file code editing, test generation, and automated debugging. GPT-5 Codex targets developers and agentic coding tools requiring a model tuned specifically for programming tasks.
9 months newer
Claude 3.5 Sonnet
Anthropic
2024-10-22
GPT-5 Codex
OpenAI
2025-08
Performance Metrics
Context window and performance specifications
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Knowledge Cutoff
Training data recency comparison
Claude 3.5 Sonnet
2024-04
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 3.5 Sonnet
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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GPT-5 Codex
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Claude 3.5 Sonnet
Avg Score:0.0%
Providers:3
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GPT-5 Codex
Avg Score:0.0%
Providers:0