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Claude Haiku 4.5 vs GPT-5 Codex
Comprehensive side-by-side LLM comparison
GPT-5 Codex leads with 1.2% higher average benchmark score. Claude Haiku 4.5 supports multimodal inputs. Claude Haiku 4.5 is available on 3 providers. Both models have their strengths depending on your specific coding needs.
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Anthropic
Claude Haiku 4.5, released by Anthropic in October 2025, is a fast, efficient large language model from the Claude 4.5 family optimized for high-throughput, low-latency workloads. It features a 200K token context window, 64K maximum output tokens, native image understanding, and extended thinking capabilities. Haiku 4.5 targets latency-sensitive applications such as real-time assistants, document classification, and lightweight agentic tasks where rapid response times are a primary requirement.
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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.
2 months newer
GPT-5 Codex
OpenAI
2025-08
Claude Haiku 4.5
Anthropic
2025-10-01
Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude Haiku 4.5
Average Score:73.3%
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GPT-5 Codex
Average Score:74.5%(+1.2%)
Performance comparison across key benchmark categories
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Claude Haiku 4.5
Coding73.3%
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GPT-5 Codex
Coding74.5%(+1.2%)
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Knowledge Cutoff
Training data recency comparison
Claude Haiku 4.5
2025-02
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 Haiku 4.5
3 providers
Anthropic
AWS Bedrock
Google Cloud Vertex AI
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GPT-5 Codex
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Claude Haiku 4.5
Avg Score:73.3%
Providers:3
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GPT-5 Codex
Avg Score:74.5%(+1.2%)
Providers:0