AnthropicClaude Haiku 4.5VSOpenAIGPT-5.5
Our Take
We recommend GPT-5.5 if you need peak intelligence for complex complex codebases, multi-file repositories, and architectural planning, or the 5.6x cheaper Claude Haiku 4.5 if your workflow is limited to multi-file code and clearly defined tasks. While GPT-5.5 holds a major reasoning advantage, Claude Haiku 4.5 is optimized for high-volume budget pipelines. Choose GPT-5.5 for architectural codebase planning, or Claude Haiku 4.5 to maximize your budget for basic scripts.
▶WHY?
Benchmark Calculations & Evidence:
Coding Evaluation: Claude Haiku 4.5 was evaluated on SWE-bench Verified (scoring 73.3%), while GPT-5.5 was evaluated on SWE-bench Pro (scoring 58.6%).
Reasoning Accuracy: Both models were evaluated on the GPQA Diamond benchmark. GPT-5.5 scored 93.6%, while Claude Haiku 4.5 scored 73%.
Cost Efficiency: Claude Haiku 4.5 pricing ($1/M input, $5/M output) is 5.6x cheaper than GPT-5.5 ($5/M input, $30/M output).
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Benchmarks & Scores
Coding (swe-bench-verified)
73.3%multi-file code and clearly defined tasks
Reasoning (gpqa-diamond)
73%graduate-level science QA
Cost & Context
Cost (per 1M tokens)5.6x cheaper
$2.00Input: $1.00 | Output: $5.00Context Window
200k tokensBenchmarks & Scores
Coding (swe-bench-pro)
58.6%complex codebases, multi-file repositories, and architectural planning
Reasoning (gpqa-diamond)Winner (+20.6%)
93.6%graduate-level science QA
Cost & Context
Cost (per 1M tokens)
$11.25Input: $5.00 | Output: $30.00Context WindowLarger
1.05M tokensFrequently Asked Questions about Claude Haiku 4.5 vs GPT-5.5
Claude Haiku 4.5 is cheaper than GPT-5.5. Claude Haiku 4.5 has a blended cost of $2.00/1M tokens, which is about 5.6x cheaper than GPT-5.5 at $11.25/1M tokens.
For coding tasks, Claude Haiku 4.5 scores 73.3% on swe-bench-verified (multi-file code and clearly defined tasks), while GPT-5.5 scores 58.6% on swe-bench-pro (complex codebases, multi-file repositories, and architectural planning).
Related Matchups
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