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Head-to-head comparison

GPT-4o (2024-08-06) vs GPT-5.6 Sol

GPT-4o (2024-08-06) (OpenAI) and GPT-5.6 Sol (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-5.6 Sol holds the stronger ModelCap Index position (#5 vs #110); and GPT-5.6 Sol offers the longer context window (1M vs 128K tokens).

Which should you choose?

Choose GPT-4o (2024-08-06) if…

  • ModelCap publishes no field on which GPT-4o (2024-08-06) leads GPT-5.6 Sol for this pair.

Choose GPT-5.6 Sol if…

  • you want the stronger overall ModelCap Index position — #5 against #110 (81.4 vs 24.2 points).
  • your workload is prompt-heavy — input tokens cost $2.00/1M against $2.50/1M.
  • you need the longer context window — 1M tokens against 128K.
  • you want provider choice — 3 listed API providers against 2.
  • Arena coding is your yardstick — 1529 against 1360.
  • AA Intelligence Index is your yardstick — 60.9 against 9.4.
  • AA τ²-Bench Telecom is your yardstick — 85.1% against 28.9%.
  • AA Humanity's Last Exam is your yardstick — 49.5% against 2.3%.
  • you want the more recently listed model — GPT-5.6 Sol was listed 9 July 2026, GPT-4o (2024-08-06) 6 August 2024.

GPT-4o (2024-08-06) vs GPT-5.6 Sol: specs, pricing and context

Specification comparison of GPT-4o (2024-08-06) and GPT-5.6 Sol
FieldGPT-4o (2024-08-06)OpenAIGPT-5.6 SolOpenAI
ModelCap Index position#110#5
Index score24.281.4
EvidenceMeasuredMeasured
Input price / 1M tokens$2.50$2.00
Output price / 1M tokens$10.00$10.00
Context window128K tokens1M tokens
Max output tokens16K128K
API providers listed23
Weight accessAPI onlyAPI only
Input modalitiesText, Image, FileFile, Image, Text
First listed6 August 20249 July 2026
PublisherOpenAIOpenAI

Evidence: 3 public benchmark observations across 3 boards · 7 public benchmark observations across 7 boards. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: GPT-4o (2024-08-06) vs GPT-5.6 Sol

Public benchmark boards where GPT-4o (2024-08-06) or GPT-5.6 Sol has a published result
BoardGPT-4o (2024-08-06)GPT-5.6 SolLeads
Arena codingArena (LMArena)13601352–136815291521–1537X-HighGPT-5.6 Sol
LMArena AgentLMArena—9.8%8.2%–11.3%X-HighOnly one result
ARC-AGI-2ARC Prize Foundation—92.5%MaxOnly one result
ARC-AGI-3ARC Prize Foundation—7.8%MaxOnly one result
AA Intelligence IndexArtificial Analysis9.4intelligence-index60.9intelligence-indexGPT-5.6 Sol
AA Terminal-Bench 2.1Artificial Analysis—88.0%terminal-bench-2.1Only one result
AA τ²-Bench TelecomArtificial Analysis28.9%tau2-bench-telecom85.1%tau2-bench-telecomGPT-5.6 Sol
AA Humanity's Last ExamArtificial Analysis2.3%humanitys-last-exam49.5%humanitys-last-examGPT-5.6 Sol
Terminal-Bench 4.0Terminal-Bench (Laude Institute)—37.3%33.5%–41.1%Codex · MaxOnly one result
WildClawBench OpenClawWildClawBench—67.2Only 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-5.6 Sol: common questions

Is GPT-4o (2024-08-06) better than GPT-5.6 Sol?

GPT-5.6 Sol ranks higher on the ModelCap Index as of 3 September 2026: #5 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-5.6 Sol?

Both list the same output price, $10.00/1M tokens, with input at $2.50/1M and $2.00/1M respectively.

Which has the bigger context window, GPT-4o (2024-08-06) or GPT-5.6 Sol?

GPT-5.6 Sol has the larger context window: 1M tokens against 128K.

Which is better for coding, GPT-4o (2024-08-06) or GPT-5.6 Sol?

Arena coding: GPT-4o (2024-08-06) 1360, GPT-5.6 Sol 1529 — GPT-5.6 Sol leads.

Are GPT-4o (2024-08-06) and GPT-5.6 Sol open-weight models?

GPT-4o (2024-08-06): API only. GPT-5.6 Sol: 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-5.6 Sol?

ModelCap currently lists 2 API providers for GPT-4o (2024-08-06) and 3 for GPT-5.6 Sol, 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-5.6 Sol 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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