Head-to-head comparison

GPT-4o (2024-08-06) vs o3

GPT-4o (2024-08-06) (OpenAI) and o3 (OpenAI) compared on the ModelCap Index, API price, context window, provider availability, weight access and every public benchmark board they share. Figures are the same ones shown on the live rankings; nothing here is a hidden score.

Snapshot as of 3 September 2026

As of 3 September 2026, o3 holds the stronger ModelCap Index position (#39 vs #110); o3 is 1.3× cheaper per output token ($8.00/1M vs $10.00/1M); and o3 offers the longer context window (200K vs 128K tokens).

Which should you choose?

Choose GPT-4o (2024-08-06) if…

you want provider choice — 2 listed API providers against 1.

Choose o3 if…

you want the stronger overall ModelCap Index position — #39 against #110 (55.7 vs 24.2 points).
API cost matters — $8.00/1M output tokens against $10.00/1M, about 1.3× cheaper.
your workload is prompt-heavy — input tokens cost $2.00/1M against $2.50/1M.
you need the longer context window — 200K tokens against 128K.
Arena coding is your yardstick — 1460 against 1360.
AA Intelligence Index is your yardstick — 31.1 against 9.4.
AA τ²-Bench Telecom is your yardstick — 80.7% against 28.9%.
AA Humanity's Last Exam is your yardstick — 20.1% against 2.3%.
you want the more recently listed model — o3 was listed 16 April 2025, GPT-4o (2024-08-06) 6 August 2024.

GPT-4o (2024-08-06) vs o3: specs, pricing and context

Specification comparison of GPT-4o (2024-08-06) and o3
Field	GPT-4o (2024-08-06)OpenAI	o3OpenAI
ModelCap Index position	#110	#39
Index score	24.2	55.7
Evidence	Measured	Measured
Input price / 1M tokens	$2.50	$2.00
Output price / 1M tokens	$10.00	$8.00
Context window	128K tokens	200K tokens
Max output tokens	16K	100K
API providers listed	2	1
Weight access	API only	API only
Input modalities	Text, Image, File	Image, Text, File
First listed	6 August 2024	16 April 2025
Publisher	OpenAI	OpenAI

Evidence: 3 public benchmark observations across 3 boards · 4 public benchmark observations across 4 boards. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: GPT-4o (2024-08-06) vs o3

Public benchmark boards where GPT-4o (2024-08-06) or o3 has a published result
Board	GPT-4o (2024-08-06)	o3	Leads
Arena codingArena (LMArena)	13601352–1368	14601454–1466	o3
ARC-AGI-2ARC Prize Foundation	—	6.5%High	Only one result
SWE-benchSWE-bench (Princeton / SWE-agent team)	—	58.4%	Only one result
BFCL V4UC Berkeley (Gorilla)	—	63.1Prompt	Only one result
AA Intelligence IndexArtificial Analysis	9.4intelligence-index	31.1intelligence-index	o3
AA τ²-Bench TelecomArtificial Analysis	28.9%tau2-bench-telecom	80.7%tau2-bench-telecom	o3
AA Humanity's Last ExamArtificial Analysis	2.3%humanitys-last-exam	20.1%humanitys-last-exam	o3

Scores are the sources' own published figures for each model's best evaluated configuration; ModelCap never re-runs a benchmark.

Want a different pairing? Open the interactive comparison tool to swap either model for any current ranked language model.

GPT-4o (2024-08-06) vs o3: common questions

Is GPT-4o (2024-08-06) better than o3?

o3 ranks higher on the ModelCap Index as of 3 September 2026: #39 against #110. That is a capability ranking built from public benchmark evidence with published uncertainty; whether it is "better" for you also depends on price, context and where you can run it.

Is GPT-4o (2024-08-06) cheaper than o3?

o3 is cheaper on output tokens: $8.00/1M against $10.00/1M. Input tokens are $2.50/1M for GPT-4o (2024-08-06) and $2.00/1M for o3. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens.

Which has the bigger context window, GPT-4o (2024-08-06) or o3?

o3 has the larger context window: 200K tokens against 128K.

Which is better for coding, GPT-4o (2024-08-06) or o3?

Arena coding: GPT-4o (2024-08-06) 1360, o3 1460 — o3 leads.

Are GPT-4o (2024-08-06) and o3 open-weight models?

GPT-4o (2024-08-06): API only. o3: API only. Open weights mean the checkpoint can be downloaded and self-hosted under its licence; API-only models are available solely through hosted endpoints.

Where can I run GPT-4o (2024-08-06) and o3?

ModelCap currently lists 2 API providers for GPT-4o (2024-08-06) and 1 for o3, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this GPT-4o (2024-08-06) vs o3 comparison?

Every figure comes from the sealed ModelCap dataset published 3 September 2026; the page re-renders within a minute of each data refresh, and the ModelCap Index positions are the same ones shown on the live rankings.