GPT-5.3 Codex vs GPT-5 mini

Compare OpenAI and OpenAI AI models

OpenAI

GPT-5.3 Codex

OpenAI

GPT-5 mini

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

GPT-5.3 Codex

Per Request:$0.008750

Daily:$0.875

Monthly:$26.25

Yearly:$319.375

GPT-5 mini

Per Request:$0.001250

Daily:$0.125

Monthly:$3.75

Yearly:$45.625

Cost Differences

$0.007500

Per Request

$0.75

Daily

$22.50

Monthly

$273.75

Yearly

GPT-5 mini costs less than GPT-5.3 Codex

Feature Comparison

Feature	GPT-5.3 Codex	GPT-5 mini
Provider	OpenAI	OpenAI
Input Price	$1.75/1M tokens	$0.25/1M tokens
Output Price	$14.00/1M tokens	$2.00/1M tokens
Context Window	256,000 tokens	500,000 tokens
Max Output	32,768 tokens	65,536 tokens
Category	coding	efficient
Capabilities	textcode	textvisioncode
Release Date	3/1/2026	8/7/2025

GPT-5.3 Codex vs GPT-5 mini: Which Should You Choose?

Choosing between GPT-5.3 Codex and GPT-5 mini depends on your priorities: cost efficiency, context length, or raw capability. GPT-5 mini is the more affordable option at $0.25/1M input tokens — 86% cheaper than GPT-5.3 Codex. Meanwhile, GPT-5 mini offers a significantly larger context window at 500,000 tokens vs 256,000 for GPT-5.3 Codex.

These models target different tiers: GPT-5.3 Codex is a coding model while GPT-5 mini is efficient. This means they're optimized for different workloads. GPT-5 mini targets more demanding workloads, while GPT-5.3 Codex provides a cost-effective option for everyday tasks.

Output costs matter too. GPT-5.3 Codex charges $14.00/1M output tokens vs $2.00 for GPT-5 mini. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. GPT-5 mini has the edge here at $2.00/1M output tokens.

Multimodal capabilities: GPT-5 mini supports vision (image inputs) while GPT-5.3 Codex is text-only. If your application needs image understanding, this narrows your choice.

Best Use Cases

Choose GPT-5.3 Codex when:

• You're already using OpenAI's API ecosystem

Choose GPT-5 mini when:

• Budget is a primary concern
• You need a larger context window (500,000 tokens)
• You need more capabilities (vision)
• You need longer outputs (up to 65,536 tokens)
• You're already using OpenAI's API ecosystem
• You're running high-volume, latency-sensitive workloads

Try Different Scenarios

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

GPT-5.3 Codex (OpenAI)

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GPT-5 mini (OpenAI)

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Frequently Asked Questions

Which is cheaper, GPT-5.3 Codex or GPT-5 mini?▼

GPT-5 mini is cheaper for input tokens at $0.25 per million tokens vs $1.75 for GPT-5.3 Codex — that's 86% savings on input costs.

What is the context window difference between GPT-5.3 Codex and GPT-5 mini?▼

GPT-5.3 Codex supports 256,000 tokens while GPT-5 mini supports 500,000 tokens — a difference of 244,000 tokens in favor of GPT-5 mini.

Which model is better for AI Chatbot?▼

Both models support text. For ai chatbot, GPT-5 mini is the lower-cost option, while GPT-5 mini offers a larger context window (500,000 vs 256,000 tokens). Choose GPT-5 mini for budget sensitivity or GPT-5 mini 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, GPT-5.3 Codex costs about $26.25/month and GPT-5 mini costs about $3.75/month. Overall, GPT-5 mini has lower combined input + output rates ($0.25 in, $2.00 out) vs GPT-5.3 Codex.