AnthropicClaude Haiku 4.5VSOpenAIGPT-5.6 Sol

Analysis by:the whichllmmodel Editorial Team|Updated: June 2026

Our Take

This matchup represents a clear tradeoff between peak intelligence and budget efficiency. GPT-5.6 Sol is noticeably superior (holding a 23.3% average lead in benchmarks), but it carries a massive 5.6x price premium. Choose GPT-5.6 Sol if you need top-tier reasoning or code debugging, but for high-volume pipelines, Claude Haiku 4.5 is the smarter business decision.

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Model Specs

Claude Haiku 4.5

Website

Benchmarks & Scores

Coding (swe-bench-pro)

39.5%

excellent at multi-file repositories, autonomous agents, and industrial codebases

Reasoning (gpqa-diamond)

73%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)5.6x cheaper

$2.00Input: $1.00 | Output: $5.00

Context Window

200k tokens

Model Specs

GPT-5.6 Sol

Website

Benchmarks & Scores

Coding (swe-bench-pro)Winner (+25.1%)

64.6%

excellent at multi-file repositories, autonomous agents, and industrial codebases

Reasoning (gpqa-diamond)Winner (+21.6%)

94.6%

graduate-level science QA

Cost & Context

Cost (per 1M tokens)

$11.25Input: $5.00 | Output: $30.00

Context WindowLarger

1.05M tokens

Read our data collection methodology

Frequently Asked Questions about Claude Haiku 4.5 vs GPT-5.6 Sol

Claude Haiku 4.5 is cheaper than GPT-5.6 Sol. Claude Haiku 4.5 has a blended cost of $2.00/1M tokens, which is about 5.6x cheaper than GPT-5.6 Sol at $11.25/1M tokens.

GPT-5.6 Sol is better for coding tasks on this benchmark. It scores 64.6% on swe-bench-pro (excellent at multi-file repositories, autonomous agents, and industrial codebases) compared to Claude Haiku 4.5 which scores 39.5%.

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