Claude 3.5 Haiku vs Codex Mini

Claude 3.5 Haiku vs Codex Mini: Claude 3.5 Haiku is cheaper for input-heavy usage ($0.80/M vs $1.50/M input tokens), while Claude 3.5 Haiku is better for long-context tasks (200,000 tokens).

Direct answer: choose Claude 3.5 Haiku for lower token spend and choose Claude 3.5 Haiku 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 3.5 Haiku

OpenAI

Codex Mini

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Claude 3.5 Haiku pricing page Codex Mini pricing page Anthropic provider overview OpenAI provider overview

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

Claude 3.5 Haiku

Per Request:$0.002800

Daily:$0.28

Monthly:$8.40

Yearly:$102.20

Codex Mini

Per Request:$0.004500

Daily:$0.45

Monthly:$13.50

Yearly:$164.25

Cost Differences

+$0.001700

Per Request

+$0.17

Daily

+$5.10

Monthly

+$62.05

Yearly

Codex Mini costs more than Claude 3.5 Haiku

Quick Recommendation

Winner for direct API pricing: Claude 3.5 Haiku. At the default workload, Claude 3.5 Haiku saves about $5.10/month ($62.05/year) versus Codex Mini.

Claude 3.5 Haiku 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 3.5 Haiku	Codex Mini
Provider	Anthropic	OpenAI
Input Price	$0.80/1M tokens	$1.50/1M tokens
Output Price	$4.00/1M tokens	$6.00/1M tokens
Context Window	200,000 tokens	200,000 tokens
Max Output	8,192 tokens	32,768 tokens
Category	efficient	efficient
Capabilities	textvision	textcodereasoning
Release Date	11/4/2024	2/2/2026

Claude 3.5 Haiku vs Codex Mini: Which Should You Choose?

Choosing between Claude 3.5 Haiku and Codex Mini depends on your priorities: cost efficiency, context length, or raw capability. Claude 3.5 Haiku is the more affordable option at $0.80/1M input tokens — 47% 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 3.5 Haiku would save you roughly $510.00/month compared to Codex Mini. For startups and indie developers, that difference can be significant.

Output costs matter too. Claude 3.5 Haiku charges $4.00/1M output tokens vs $6.00 for Codex Mini. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Claude 3.5 Haiku has the edge here at $4.00/1M output tokens.

Multimodal capabilities: Claude 3.5 Haiku 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 3.5 Haiku when:

• Budget is a primary concern
• 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 need longer outputs (up to 32,768 tokens)
• You're already using OpenAI's API ecosystem
• You're running high-volume, latency-sensitive workloads

Pros and Caveats at a Glance

Claude 3.5 Haiku

• Input pricing: $0.80/M tokens
• Output pricing: $4.00/M tokens
• Context window: 200,000 tokens
• Max output: 8,192 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 3.5 Haiku
• Higher output cost than Claude 3.5 Haiku

Try Different Scenarios

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

Claude 3.5 Haiku (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 3.5 Haiku today

Start using Codex Mini today

Frequently Asked Questions

Which is cheaper, Claude 3.5 Haiku or Codex Mini?▼

Claude 3.5 Haiku is cheaper for input tokens at $0.80 per million tokens vs $1.50 for Codex Mini — that's 47% savings on input costs.

What is the context window difference between Claude 3.5 Haiku and Codex Mini?▼

Claude 3.5 Haiku supports 200,000 tokens while Codex Mini supports 200,000 tokens — a difference of 0 tokens in favor of Claude 3.5 Haiku.

Which model is better for AI Chatbot?▼

Both models support text. For ai chatbot, Claude 3.5 Haiku is the lower-cost option, while Claude 3.5 Haiku offers a larger context window (200,000 vs 200,000 tokens). Choose Claude 3.5 Haiku for budget sensitivity or Claude 3.5 Haiku 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 3.5 Haiku costs about $8.40/month and Codex Mini costs about $13.50/month. Overall, Claude 3.5 Haiku has lower combined input + output rates ($0.80 in, $4.00 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.