Codex Mini vs o3-pro

Compare OpenAI and OpenAI AI models

OpenAI

Codex Mini

OpenAI

o3-pro

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

Codex Mini

Per Request:$0.004500

Daily:$0.45

Monthly:$13.50

Yearly:$164.25

o3-pro

Per Request:$0.06

Daily:$6.00

Monthly:$180.00

Yearly:$2,190.00

Cost Differences

+$0.0555

Per Request

+$5.55

Daily

+$166.50

Monthly

+$2,025.75

Yearly

o3-pro costs more than Codex Mini

Feature Comparison

Feature	Codex Mini	o3-pro
Provider	OpenAI	OpenAI
Input Price	$1.50/1M tokens	$20.00/1M tokens
Output Price	$6.00/1M tokens	$80.00/1M tokens
Context Window	200,000 tokens	1,000,000 tokens
Max Output	32,768 tokens	131,072 tokens
Category	efficient	reasoning
Capabilities	textcodereasoning	textreasoningcode
Release Date	2/2/2026	6/10/2025

Codex Mini vs o3-pro: Which Should You Choose?

Choosing between Codex Mini and o3-pro depends on your priorities: cost efficiency, context length, or raw capability. Codex Mini is the more affordable option at $1.50/1M input tokens — 93% cheaper than o3-pro. Meanwhile, o3-pro offers a significantly larger context window at 1,000,000 tokens vs 200,000 for Codex Mini.

These models target different tiers: Codex Mini is a efficient model while o3-pro is reasoning. This means they're optimized for different workloads. o3-pro targets more demanding workloads, while Codex Mini provides a cost-effective option for everyday tasks.

Output costs matter too. Codex Mini charges $6.00/1M output tokens vs $80.00 for o3-pro. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. Codex Mini has the edge here at $6.00/1M output tokens.

Best Use Cases

Choose Codex Mini when:

• Budget is a primary concern
• You're already using OpenAI's API ecosystem
• You're running high-volume, latency-sensitive workloads

Choose o3-pro when:

• You need a larger context window (1,000,000 tokens)
• You need longer outputs (up to 131,072 tokens)
• You're already using OpenAI's API ecosystem

Try Different Scenarios

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

Codex Mini (OpenAI)

Cost Calculator

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Model

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Output Tokens

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o3-pro (OpenAI)

Cost Calculator

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Model

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Start using Codex Mini today

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Frequently Asked Questions

Which is cheaper, Codex Mini or o3-pro?▼

Codex Mini is cheaper for input tokens at $1.50 per million tokens vs $20.00 for o3-pro — that's 93% savings on input costs.

What is the context window difference between Codex Mini and o3-pro?▼

Codex Mini supports 200,000 tokens while o3-pro supports 1,000,000 tokens — a difference of 800,000 tokens in favor of o3-pro.

Which model is better for AI Agent / Agentic Workflows?▼

Both models support text, code, reasoning. For ai agent / agentic workflows, Codex Mini is the lower-cost option, while o3-pro offers a larger context window (1,000,000 vs 200,000 tokens). Choose Codex Mini for budget sensitivity or o3-pro 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, Codex Mini costs about $13.50/month and o3-pro costs about $180.00/month. Overall, Codex Mini has lower combined input + output rates ($1.50 in, $6.00 out) vs o3-pro.