Claude Haiku 4.5 vs Codex Mini

Claude Haiku 4.5 vs Codex Mini: Claude Haiku 4.5 is cheaper for input-heavy usage ($1.00/M vs $1.50/M input tokens), while Claude Haiku 4.5 is better for long-context tasks (200,000 tokens).

Direct answer: choose Claude Haiku 4.5 for lower token spend and choose Claude Haiku 4.5 when your workload needs longer context.

Compare input and output token pricing, context windows, and monthly cost estimates on one page so you can pick the cheaper model fast.

Anthropic

Claude Haiku 4.5

OpenAI

Codex Mini

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Claude Haiku 4.5 pricing page Codex Mini pricing page Anthropic provider overview OpenAI provider overview

Cost Comparison (1000 input + 500 output tokens, 100 requests/day)

Claude Haiku 4.5

Per Request:$0.003500

Daily:$0.35

Monthly:$10.50

Yearly:$127.75

Codex Mini

Per Request:$0.004500

Daily:$0.45

Monthly:$13.50

Yearly:$164.25

Cost Differences

+$0.001000

Per Request

+$0.10

Daily

+$3.00

Monthly

+$36.50

Yearly

Codex Mini costs more than Claude Haiku 4.5

Quick Recommendation

Winner for direct API pricing: Claude Haiku 4.5. At the default workload, Claude Haiku 4.5 saves about $3.00/month ($36.50/year) versus Codex Mini.

Claude Haiku 4.5 full pricing breakdown Codex Mini full pricing breakdown Anthropic API pricing details OpenAI API pricing details Anthropic vs OpenAI API pricing Codex Mini vs o4-mini Deep Research Codex Mini vs o3 Deep Research

Feature Comparison

Feature	Claude Haiku 4.5	Codex Mini
Provider	Anthropic	OpenAI
Input Price	$1.00/1M tokens	$1.50/1M tokens
Output Price	$5.00/1M tokens	$6.00/1M tokens
Context Window	200,000 tokens	200,000 tokens
Max Output	64,000 tokens	32,768 tokens
Category	efficient	efficient
Capabilities	textvision	textcodereasoning
Release Date	10/15/2025	2/2/2026

Claude Haiku 4.5 vs Codex Mini: Which Should You Choose?

Choosing between Claude Haiku 4.5 and Codex Mini depends on your priorities: cost efficiency, context length, or raw capability. Claude Haiku 4.5 is the more affordable option at $1.00/1M input tokens — 33% cheaper than Codex Mini.

These models come from different providers — Anthropic and OpenAI — which means different API ecosystems, SDKs, rate limits, and terms of service. If you're already integrated with Anthropic, switching to OpenAIinvolves migration effort beyond just pricing. Factor in your existing infrastructure when deciding.

Both models are in the efficient category, making this a direct head-to-head comparison. At scale — say 10,000 requests per day — the cost difference adds up: Claude Haiku 4.5 would save you roughly $300.00/month compared to Codex Mini. For startups and indie developers, that difference can be significant.

Output costs matter too. Claude Haiku 4.5 charges $5.00/1M output tokens vs $6.00 for Codex Mini. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Claude Haiku 4.5 has the edge here at $5.00/1M output tokens.

Multimodal capabilities: Claude Haiku 4.5 supports vision (image inputs) while Codex Mini is text-only. If your application needs image understanding, this narrows your choice.

Best Use Cases

Choose Claude Haiku 4.5 when:

• Budget is a primary concern
• You need longer outputs (up to 64,000 tokens)
• You're already using Anthropic's API ecosystem
• You're running high-volume, latency-sensitive workloads

Choose Codex Mini when:

• You need more capabilities (code, reasoning)
• You're already using OpenAI's API ecosystem
• You're running high-volume, latency-sensitive workloads

Pros and Caveats at a Glance

Claude Haiku 4.5

• Input pricing: $1.00/M tokens
• Output pricing: $5.00/M tokens
• Context window: 200,000 tokens
• Max output: 64,000 tokens

Watch out for

• Trade-offs are minor in this matchup.

Codex Mini

• Input pricing: $1.50/M tokens
• Output pricing: $6.00/M tokens
• Context window: 200,000 tokens
• Max output: 32,768 tokens

Watch out for

• Higher input cost than Claude Haiku 4.5
• Higher output cost than Claude Haiku 4.5

Try Different Scenarios

Use the calculator below to see how costs change with different usage patterns

Claude Haiku 4.5 (Anthropic)

Cost Calculator

Provider

Model

Input Tokens

Output Tokens

Requests/Day

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Codex Mini (OpenAI)

Cost Calculator

Provider

Model

Input Tokens

Output Tokens

Requests/Day

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Start using Claude Haiku 4.5 today

Start using Codex Mini today

Frequently Asked Questions

Which is cheaper, Claude Haiku 4.5 or Codex Mini?▼

Claude Haiku 4.5 is cheaper for input tokens at $1.00 per million tokens vs $1.50 for Codex Mini — that's 33% savings on input costs.

What is the context window difference between Claude Haiku 4.5 and Codex Mini?▼

Claude Haiku 4.5 supports 200,000 tokens while Codex Mini supports 200,000 tokens — a difference of 0 tokens in favor of Claude Haiku 4.5.

Which model is better for AI Chatbot?▼

Both models support text. For ai chatbot, Claude Haiku 4.5 is the lower-cost option, while Claude Haiku 4.5 offers a larger context window (200,000 vs 200,000 tokens). Choose Claude Haiku 4.5 for budget sensitivity or Claude Haiku 4.5 for longer context tasks.

Which model has better overall pricing for heavy usage?▼

At 100 requests/day with 1,000 input and 500 output tokens each, Claude Haiku 4.5 costs about $10.50/month and Codex Mini costs about $13.50/month. Overall, Claude Haiku 4.5 has lower combined input + output rates ($1.00 in, $5.00 out) vs Codex Mini.

Where can I compare Anthropic and OpenAI API pricing beyond this model matchup?▼

See the Anthropic vs OpenAI provider comparison page for lineup-level averages, then review each model page for exact per-token rates.