GPT-4o vs o3

API pricing, context window and capabilities for GPT-4o and o3, side by side. Prices are the cheapest listed serving route per 1M tokens, from LiteLLM and OpenRouter.

Verdict

computed from the published numbers

o3 wins on price, on intelligence and on context window. Benchmark data is unavailable for one or both models.

Price

Terminal-Bench

Not called

Intelligence

Context window

Key takeaways

who wins on what, from the published numbers

GPT-4o wins

More serving providers (6 vs 4)
Supports audio

o3 wins

Cheaper input ($2.50 vs $2.00 /1M)
Cheaper output ($10.00 vs $8.00 /1M)
Larger context window (131K vs 200K)
Higher max output (16K vs 100K)
Has reasoning mode
Has web search

Cheaper overall

$2.00 + $8.00 /1M

Larger context

200K

More providers

GPT-4o

6 providers

Pricing & specs

cheapest listed route · per 1M tokens

On-demand listed rates, OpenRouter routed quotes and Vercel reseller quotes. Enterprise commitments can be materially lower.

	GPT-4o	o3
Input $/1M	$2.50via OpenAI	$2.00via OpenAI best
Output $/1M	$10.00via OpenAI	$8.00via OpenAI best
Context window	131K	200K best
Max output	16K	100K best
Serving providers	6 best	4
Date	Released May 13, 2024	Released Apr 16, 2025

Benchmarks

Benchmark scores, side by side

	GPT-4o	o3
Intelligence	8.4	20.2 best
GPQA Diamond	54%	83% best
Output speed	150 t/s best	121 t/s
Latency (TTFT)	0.79s best	6.79s

Cost calculator

choose a serving route for each side

GPT-4o · route

o3 · route

Input tokens / month

Output tokens / month

GPT-4o

via Gmi

$23

via Azure

$18

Capabilities

feature support, side by side

Feature	GPT-4o	o3
Vision	✓	✓
Tool use	✓	✓
Reasoning	—	✓
Audio	✓	—
Prompt caching	✓	✓
Structured output	✓	✓
Web search	—	✓

Frequently asked questions

Which is cheaper, GPT-4o or o3?

o3 is cheaper for input ($2.50 vs $2.00 per 1M tokens) from OpenAI. o3 is cheaper for output ($10.00 vs $8.00 per 1M tokens) from OpenAI.

What is the context window difference between GPT-4o and o3?

GPT-4o has a 131K-token context window and o3 has 200K tokens, so o3 can take a larger prompt.

How do GPT-4o and o3 compare on benchmarks?

On the tracked benchmarks, o3 leads on intelligence.

Listed prices from LiteLLM, OpenRouter and Vercel · last checked Oct 14, 2026

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