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Head-to-head comparison

GPT-4 Turbo vs gpt-oss-120b

GPT-4 Turbo (OpenAI) and gpt-oss-120b (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 23 September 2026

As of 23 September 2026, gpt-oss-120b holds the stronger ModelCap Index position (#133 vs #172); gpt-oss-120b is 50× cheaper per output token ($0.60/1M vs $30.00/1M); gpt-oss-120b offers the longer context window (131K vs 128K tokens); and gpt-oss-120b ships open weights.

Which should you choose?

Choose GPT-4 Turbo if…

  • ModelCap publishes no field on which GPT-4 Turbo leads gpt-oss-120b for this pair.

Choose gpt-oss-120b if…

  • you want the stronger overall ModelCap Index position — #133 against #172 (43.3 vs 30.9 points).
  • API cost matters — $0.60/1M output tokens against $30.00/1M, about 50× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.15/1M against $10.00/1M.
  • you need the longer context window — 131K tokens against 128K.
  • you want to self-host: gpt-oss-120b ships open weights while GPT-4 Turbo is api only.
  • you want provider choice — 20 listed API providers against 1.
  • Arena coding is your yardstick — 1391 against 1347.
  • AA Humanity's Last Exam is your yardstick — 19.6% against 3.1%.
  • you want the more recently listed model — gpt-oss-120b was listed 5 August 2025, GPT-4 Turbo 9 April 2024.

GPT-4 Turbo vs gpt-oss-120b: specs, pricing and context

Specification comparison of GPT-4 Turbo and gpt-oss-120b
FieldGPT-4 TurboOpenAIgpt-oss-120bOpenAI
ModelCap Index position#172#133
Index score30.943.3
EvidenceMeasuredMeasured
Input price / 1M tokens$10.00$0.15
Output price / 1M tokens$30.00$0.60
Context window128K tokens131K tokens
Max output tokens4K66K
API providers listed120
Weight accessAPI onlyOpen weights
Input modalitiesText, ImageText
First listed9 April 20245 August 2025
PublisherOpenAIOpenAI

Evidence: 2 public benchmark observations across 2 boards · 3 public benchmark observations across 3 boards. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: GPT-4 Turbo vs gpt-oss-120b

Public benchmark boards where GPT-4 Turbo or gpt-oss-120b has a published result
BoardGPT-4 Turbogpt-oss-120bLeads
Arena codingArena (LMArena)13471340–135413911383–1398gpt-oss-120b
SWE-benchSWE-bench (Princeton / SWE-agent team)—26.0%Only one result
AA Intelligence IndexArtificial Analysis—11.6intelligence-index:v4.3:highOnly one result
AA τ²-Bench TelecomArtificial Analysis—65.8%tau2:telecom:dual-control:pass-at-1:3-repeats:source-model="gpt-oss-120b (high)":reasoning=trueOnly one result
AA Humanity's Last ExamArtificial Analysis3.1%hle:may-2025:text-only-2158:no-tools:pass-at-1:source-model="GPT-4 Turbo":reasoning=false19.6%hle:may-2025:text-only-2158:no-tools:pass-at-1:source-model="gpt-oss-120b (high)":reasoning=truegpt-oss-120b

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-4 Turbo vs gpt-oss-120b: common questions

Is GPT-4 Turbo better than gpt-oss-120b?

gpt-oss-120b ranks higher on the ModelCap Index as of 23 September 2026: #133 against #172. 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. Their published uncertainty intervals do not overlap, but the aggregate Index does not predict performance on every task; compare the relevant benchmark configurations before choosing.

Is GPT-4 Turbo cheaper than gpt-oss-120b?

gpt-oss-120b is cheaper on output tokens: $0.60/1M against $30.00/1M. Input tokens are $10.00/1M for GPT-4 Turbo and $0.15/1M for gpt-oss-120b. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens. For 1,000 requests with 2,000 input and 500 output tokens each (2M input + 0.5M output), the listed-rate estimate is $35.00 for GPT-4 Turbo versus $0.60 for gpt-oss-120b. gpt-oss-120b costs 98.3% less in this scenario. This excludes caching, batch discounts, prompt-length tiers, tool charges and retries; verify the selected endpoint before budgeting.

Which has the bigger context window, GPT-4 Turbo or gpt-oss-120b?

gpt-oss-120b has the larger context window: 131K tokens against 128K.

Which is better for coding, GPT-4 Turbo or gpt-oss-120b?

Arena coding: GPT-4 Turbo 1347, gpt-oss-120b 1391 — gpt-oss-120b leads.

Are GPT-4 Turbo and gpt-oss-120b open-weight models?

GPT-4 Turbo: API only. gpt-oss-120b: Open weights. 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-4 Turbo and gpt-oss-120b?

ModelCap currently lists 1 API provider for GPT-4 Turbo and 20 for gpt-oss-120b, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this GPT-4 Turbo vs gpt-oss-120b comparison?

Every figure comes from the sealed ModelCap dataset published 23 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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