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Claude Haiku 4.5 vs GPT-5.3-Codex

Claude Haiku 4.5 leads in 5 of 8 categories

Arena ELO

Claude Haiku 4.5

Cheaper

Claude Haiku 4.5

Faster

Claude Haiku 4.5

Detailed Comparison

CategoryClaude Haiku 4.5GPT-5.3-Codex
ProviderAnthropic OpenAI
Context Window200K WIN128K
Input Price ($/1M)$0.8 WIN$1.75
Output Price ($/1M)$4 WIN$14
Arena ELO1290 WINN/A
Codingunknown N/A
Reasoningunknown N/A
Speed (tokens/sec)~120 t/s WINN/A
Open SourceNo No

Frequently Asked Questions

Which is cheaper, Claude Haiku 4.5 or GPT-5.3-Codex?

Claude Haiku 4.5 is approximately 70% cheaper than GPT-5.3-Codex per million tokens.

Which is better for coding, Claude Haiku 4.5 or GPT-5.3-Codex?

Claude Haiku 4.5 scores unknown on coding benchmarks, while GPT-5.3-Codex scores N/A.

Which has a larger context window?

Claude Haiku 4.5 supports 200K context, while GPT-5.3-Codex supports 128K.

Is Claude Haiku 4.5 or GPT-5.3-Codex open source?

Claude Haiku 4.5 is proprietary. GPT-5.3-Codex is proprietary.

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