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Claude 3.5 Haiku vs GPT-5 Codex
Comprehensive side-by-side LLM comparison
GPT-5 Codex leads with 33.9% higher average benchmark score. Claude 3.5 Haiku is available on 3 providers. Overall, GPT-5 Codex is the stronger choice for coding tasks.
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Anthropic
Claude 3.5 Haiku was developed as the next generation of Anthropic's fastest model, offering similar speed to Claude 3 Haiku while surpassing Claude 3 Opus on many intelligence benchmarks. Built with low latency, improved instruction following, and accurate tool use, it serves user-facing products, specialized sub-agent tasks, and data-heavy applications.
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OpenAI
GPT-5 Codex was developed as a specialized variant of GPT-5 optimized for programming and software development tasks. Built to understand and generate code across multiple programming languages, it serves developers with enhanced capabilities for code completion, debugging, translation, and explanation of complex codebases.
10 months newer
Claude 3.5 Haiku
Anthropic
2024-10-22
GPT-5 Codex
OpenAI
2025-09-15
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Performance Metrics
Context window and performance specifications
Average performance across 1 common benchmarks
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Claude 3.5 Haiku
Average Score:40.6%
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GPT-5 Codex
Average Score:74.5%(+33.9%)
Performance comparison across key benchmark categories
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Claude 3.5 Haiku
Coding40.6%
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GPT-5 Codex
Coding74.5%(+33.9%)
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Knowledge Cutoff
Training data recency comparison
GPT-5 Codex
2024-09-30
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 Haiku
3 providers
Anthropic
Throughput: 100 tok/s
Latency: 0.3ms
Bedrock
Throughput: 104 tok/s
Latency: 0.5ms
Throughput: 42 tok/s
Latency: 0.4ms
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Claude 3.5 Haiku
Avg Score:40.6%
Providers:3
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GPT-5 Codex
Avg Score:74.5%(+33.9%)
Providers:0