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Head-to-head comparison

GPT-4o (2024-08-06) vs GPT-5.5 Pro

GPT-4o (2024-08-06) (OpenAI) and GPT-5.5 Pro (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, GPT-5.5 Pro holds the stronger ModelCap Index position (#80 vs #110); GPT-4o (2024-08-06) is 18× cheaper per output token ($10.00/1M vs $180/1M); and GPT-5.5 Pro offers the longer context window (1M vs 128K tokens).

Which should you choose?

Choose GPT-4o (2024-08-06) if…

  • API cost matters — $10.00/1M output tokens against $180/1M, about 18× cheaper.
  • your workload is prompt-heavy — input tokens cost $2.50/1M against $30.00/1M.
  • you want provider choice — 2 listed API providers against 1.

Choose GPT-5.5 Pro if…

  • you want the stronger overall ModelCap Index position — #80 against #110 (34.1 vs 24.2 points).
  • you need the longer context window — 1M tokens against 128K.
  • you want the more recently listed model — GPT-5.5 Pro was listed 24 April 2026, GPT-4o (2024-08-06) 6 August 2024.

GPT-4o (2024-08-06) vs GPT-5.5 Pro: specs, pricing and context

Specification comparison of GPT-4o (2024-08-06) and GPT-5.5 Pro
FieldGPT-4o (2024-08-06)OpenAIGPT-5.5 ProOpenAI
ModelCap Index position#110#80
Index score24.234.1
EvidenceMeasuredMeasured
Input price / 1M tokens$2.50$30.00
Output price / 1M tokens$10.00$180
Context window128K tokens1M tokens
Max output tokens16K128K
API providers listed21
Weight accessAPI onlyAPI only
Input modalitiesText, Image, FileFile, Image, Text
First listed6 August 202424 April 2026
PublisherOpenAIOpenAI

Evidence: 3 public benchmark observations across 3 boards · 1 public benchmark observation across 1 board. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: GPT-4o (2024-08-06) vs GPT-5.5 Pro

Public benchmark boards where GPT-4o (2024-08-06) or GPT-5.5 Pro has a published result
BoardGPT-4o (2024-08-06)GPT-5.5 ProLeads
Arena codingArena (LMArena)13601352–1368—Only one result
ARC-AGI-2ARC Prize Foundation—84.6%HighOnly one result
AA Intelligence IndexArtificial Analysis9.4intelligence-index—Only one result
AA τ²-Bench TelecomArtificial Analysis28.9%tau2-bench-telecom—Only one result
AA Humanity's Last ExamArtificial Analysis2.3%humanitys-last-exam—Only one result

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 GPT-5.5 Pro: common questions

Is GPT-4o (2024-08-06) better than GPT-5.5 Pro?

GPT-5.5 Pro ranks higher on the ModelCap Index as of 3 September 2026: #80 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 GPT-5.5 Pro?

GPT-4o (2024-08-06) is cheaper on output tokens: $10.00/1M against $180/1M. Input tokens are $2.50/1M for GPT-4o (2024-08-06) and $30.00/1M for GPT-5.5 Pro. 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 GPT-5.5 Pro?

GPT-5.5 Pro has the larger context window: 1M tokens against 128K.

Which is better for coding, GPT-4o (2024-08-06) or GPT-5.5 Pro?

The two models do not share a coding benchmark board on ModelCap yet, so no head-to-head coding score is published; the ModelCap Index position is the closest overall signal.

Are GPT-4o (2024-08-06) and GPT-5.5 Pro open-weight models?

GPT-4o (2024-08-06): API only. GPT-5.5 Pro: 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 GPT-5.5 Pro?

ModelCap currently lists 2 API providers for GPT-4o (2024-08-06) and 1 for GPT-5.5 Pro, 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 GPT-5.5 Pro 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.

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