GPT-5 Pro vs o3

Compare OpenAI and OpenAI AI models

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GPT-5 Pro

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

GPT-5 Pro

Per Request:$0.075

Daily:$7.50

Monthly:$225.00

Yearly:$2,737.50

o3

Per Request:$0.006000

Daily:$0.60

Monthly:$18.00

Yearly:$219.00

Cost Differences

$0.069

Per Request

$6.90

Daily

$207.00

Monthly

$2,518.50

Yearly

o3 costs less than GPT-5 Pro

Feature Comparison

Feature	GPT-5 Pro	o3
Provider	OpenAI	OpenAI
Input Price	$15.00/1M tokens	$2.00/1M tokens
Output Price	$120.00/1M tokens	$8.00/1M tokens
Context Window	200,000 tokens	1,000,000 tokens
Max Output	100,000 tokens	131,072 tokens
Category	flagship	reasoning
Capabilities	textvisioncodereasoning	textreasoningvisioncode
Release Date	8/7/2025	4/16/2025

GPT-5 Pro vs o3: Which Should You Choose?

Choosing between GPT-5 Pro and o3 depends on your priorities: cost efficiency, context length, or raw capability. o3 is the more affordable option at $2.00/1M input tokens — 87% cheaper than GPT-5 Pro. Meanwhile, o3 offers a significantly larger context window at 1,000,000 tokens vs 200,000 for GPT-5 Pro.

These models target different tiers: GPT-5 Pro is a flagship model while o3 is reasoning. This means they're optimized for different workloads. GPT-5 Pro is built for complex tasks that require deeper reasoning, while o3 offers better value for routine operations.

Output costs matter too. GPT-5 Pro charges $120.00/1M output tokens vs $8.00 for o3. For generation-heavy workloads (content creation, code generation, summarization), output pricing often dominates your bill. o3 has the edge here at $8.00/1M output tokens.

Multimodal capabilities: Both models support vision (image understanding), so you can send images alongside text prompts with either option.

Best Use Cases

Choose GPT-5 Pro when:

• You're already using OpenAI's API ecosystem

Choose o3 when:

• Budget is a primary concern
• 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

GPT-5 Pro (OpenAI)

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o3 (OpenAI)

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Start using GPT-5 Pro today

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Frequently Asked Questions

Which is cheaper, GPT-5 Pro or o3?▼

o3 is cheaper for input tokens at $2.00 per million tokens vs $15.00 for GPT-5 Pro — that's 87% savings on input costs.

What is the context window difference between GPT-5 Pro and o3?▼

GPT-5 Pro supports 200,000 tokens while o3 supports 1,000,000 tokens — a difference of 800,000 tokens in favor of o3.

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

Both models support text, code, reasoning. For ai agent / agentic workflows, o3 is the lower-cost option, while o3 offers a larger context window (1,000,000 vs 200,000 tokens). Choose o3 for budget sensitivity or o3 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 Pro costs about $225.00/month and o3 costs about $18.00/month. Overall, o3 has lower combined input + output rates ($2.00 in, $8.00 out) vs GPT-5 Pro.