What is the difference between Claude Haiku 4.5 and OpenAI Codex Mini?

Claude Haiku 4.5 is developed by Anthropic while OpenAI Codex Mini is developed by OpenAI. Claude Haiku 4.5 has a 200K token context window vs OpenAI Codex Mini's 200K. You can compare their actual outputs across 10 challenges on Rival to see how they differ in practice.

Which is better, Claude Haiku 4.5 or OpenAI Codex Mini?

It depends on your use case. Claude Haiku 4.5 and OpenAI Codex Mini each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 10 challenges so you can judge which fits your needs best.

How much does Claude Haiku 4.5 cost compared to OpenAI Codex Mini?

Claude Haiku 4.5 costs $1/M input tokens and OpenAI Codex Mini costs $1.5/M input tokens. Claude Haiku 4.5 is $0.50/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Claude Haiku 4.5 and OpenAI Codex Mini on Rival?

This page shows a side-by-side comparison of Claude Haiku 4.5 and OpenAI Codex Mini across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

What is the difference between Claude Haiku 4.5 and OpenAI Codex Mini?

Claude Haiku 4.5 is developed by Anthropic while OpenAI Codex Mini is developed by OpenAI. Claude Haiku 4.5 has a 200K token context window vs OpenAI Codex Mini's 200K. You can compare their actual outputs across 10 challenges on Rival to see how they differ in practice.

Which is better, Claude Haiku 4.5 or OpenAI Codex Mini?

It depends on your use case. Claude Haiku 4.5 and OpenAI Codex Mini each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 10 challenges so you can judge which fits your needs best.

How much does Claude Haiku 4.5 cost compared to OpenAI Codex Mini?

Claude Haiku 4.5 costs $1/M input tokens and OpenAI Codex Mini costs $1.5/M input tokens. Claude Haiku 4.5 is $0.50/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

How can I compare Claude Haiku 4.5 and OpenAI Codex Mini on Rival?

This page shows a side-by-side comparison of Claude Haiku 4.5 and OpenAI Codex Mini across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

Updated Oct 2025

Claude Haiku 4.5vsOpenAI Codex Mini

Claude Haiku 4.5 is cheaper than OpenAI Codex Mini at $1/M vs $1.5/M input tokens.

Claude Haiku 4.5 and OpenAI Codex Mini compared across 10 shared prompts
Spec	Claude Haiku 4.5	OpenAI Codex Mini
Input price	$1/M tokens	$1.5/M tokens
Output price	$5/M tokens	$6/M tokens
Context window	200K tokens	200K tokens
Released	Oct 2025	May 2025
SWE-bench Verified	73.3%	71.3%

Our Verdict

Claude Haiku 4.5

OpenAI Codex MiniRunner-up

Not enough votes to call it. On the specs, Claude Haiku 4.5 has the edge: bigger model tier, newer.

Too close to call

What do Claude Haiku 4.5 and OpenAI Codex Mini say about your brand?

10 models, one question, verbatim receipts.

or peek at a demo: Notion Linear Vercel

API pricing

Cost per 1M tokens

Claude Haiku 4.5

Input

$1.00

1.5× cheaper

Output

$5.00

1.2× cheaper

OpenAI Codex Mini

Input

$1.50

Output

$6.00

Claude Haiku 4.5 is cheaper on both — 1.5× input, 1.2× output

Research

What we learned reading every model

FAQ

Common questions

Keep exploring

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Updated Oct 2025

Claude Haiku 4.5vsOpenAI Codex Mini

Claude Haiku 4.5 is cheaper than OpenAI Codex Mini at $1/M vs $1.5/M input tokens.

Claude Haiku 4.5 and OpenAI Codex Mini compared across 10 shared prompts
Spec	Claude Haiku 4.5	OpenAI Codex Mini
Input price	$1/M tokens	$1.5/M tokens
Output price	$5/M tokens	$6/M tokens
Context window	200K tokens	200K tokens
Released	Oct 2025	May 2025
SWE-bench Verified	73.3%	71.3%