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Head-to-head comparison

Gemma 4 31B vs GPT-6.1 Sol

Gemma 4 31B (Google) and GPT-6.1 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 2 October 2026

As of 2 October 2026, GPT-6.1 Sol holds the stronger ModelCap Index position (#4 vs #28); Gemma 4 31B is 29.4× cheaper per output token ($0.34/1M vs $10.00/1M); GPT-6.1 Sol offers the longer context window (1M vs 262K tokens); and Gemma 4 31B ships open weights.

Which should you choose?

Choose Gemma 4 31B if…

  • API cost matters — $0.34/1M output tokens against $10.00/1M, about 29.4× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.09/1M against $2.00/1M.
  • you want to self-host: Gemma 4 31B ships open weights while GPT-6.1 Sol is no linked weights.
  • you want provider choice — 13 listed API providers against 3.

Choose GPT-6.1 Sol if…

  • you want the stronger overall ModelCap Index position — #4 against #28 (83.5 vs 71.8 points).
  • you need the longer context window — 1M tokens against 262K.
  • Arena text is your yardstick — 1483 against 1453.
  • AA Humanity's Last Exam is your yardstick — 52.9% against 11.8%.
  • you want the more recently listed model — GPT-6.1 Sol was listed 29 September 2026, Gemma 4 31B 2 April 2026.

Gemma 4 31B vs GPT-6.1 Sol: specs, pricing and context

Specification comparison of Gemma 4 31B and GPT-6.1 Sol
FieldGemma 4 31BGoogleGPT-6.1 SolOpenAI
ModelCap Index position#28#4
Index score71.883.5
EvidenceMeasuredMeasured
Input price / 1M tokens$0.09$2.00
Output price / 1M tokens$0.34$10.00
Context window262K tokens1M tokens
Declared route output cap16K128K
API providers listed133
Weight accessOpen weightsNo linked weights
Input modalitiesImage, Text, VideoFile, Image, Text
First listed2 April 202629 September 2026
PublisherGoogleOpenAI

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: Gemma 4 31B vs GPT-6.1 Sol

Public benchmark boards where Gemma 4 31B or GPT-6.1 Sol has a published result
BoardGemma 4 31BGPT-6.1 SolLeads
Arena textArena (LMArena)14531445–1460Not reported14831473–1494MaxGPT-6.1 Sol
Arena codingArena (LMArena)15021487–1517—Only one result
ARC-AGI-2ARC Prize Foundation—94.2%MaxOnly one result
ARC-AGI-3ARC Prize Foundation—52.7%MaxOnly one result
AA Intelligence IndexArtificial Analysis—51.8MaxOnly one result
AA Terminal-Bench 2.1Artificial Analysis29.2%Non-reasoning—Only one result
AA τ²-Bench TelecomArtificial Analysis65.5%Non-reasoning—Only one result
AA Humanity's Last ExamArtificial Analysis11.8%Non-reasoning52.9%MaxGPT-6.1 Sol
WildClawBench OpenClawWildClawBench37.6—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.

Gemma 4 31B vs GPT-6.1 Sol: common questions

Is Gemma 4 31B better than GPT-6.1 Sol?

GPT-6.1 Sol ranks higher on the ModelCap Index as of 2 October 2026: #4 against #28. 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 overlap, so the rank difference alone does not establish a reliable capability advantage for your workload.

Is Gemma 4 31B cheaper than GPT-6.1 Sol?

Gemma 4 31B is cheaper on output tokens: $0.34/1M against $10.00/1M. Input tokens are $0.09/1M for Gemma 4 31B and $2.00/1M for GPT-6.1 Sol. 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 $0.35 for Gemma 4 31B versus $9.00 for GPT-6.1 Sol. Gemma 4 31B costs 96.1% 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, Gemma 4 31B or GPT-6.1 Sol?

GPT-6.1 Sol has the larger context window: 1M tokens against 262K. OpenRouter catalogue or provider-endpoint declaration. Limits can vary by provider and prompt length; a model-wide maximum has not been independently verified.

Which is better for coding, Gemma 4 31B or GPT-6.1 Sol?

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 Gemma 4 31B and GPT-6.1 Sol open-weight models?

Gemma 4 31B: Open weights. GPT-6.1 Sol: No linked weights. Open weights mean the checkpoint can be downloaded and self-hosted under its licence. A missing weight link does not identify every API or chat product that offers a model.

Where can I run Gemma 4 31B and GPT-6.1 Sol?

ModelCap currently lists 13 API providers for Gemma 4 31B and 3 for GPT-6.1 Sol, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this Gemma 4 31B vs GPT-6.1 Sol comparison?

Every figure and ModelCap Index position comes from the same published snapshot dated 2 October 2026. Publication and page updates happen separately; use the snapshot date shown on the page.

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