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Head-to-head comparison

Gemma 4 31B vs o3

Gemma 4 31B (Google) 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 18 August 2026

As of 18 August 2026, Gemma 4 31B holds the stronger ModelCap Index position (#30 vs #37); Gemma 4 31B is 23.5× cheaper per output token ($0.34/1M vs $8.00/1M); Gemma 4 31B offers the longer context window (262K vs 200K tokens); and Gemma 4 31B ships open weights.

Which should you choose?

Choose Gemma 4 31B if…

  • you want the stronger overall ModelCap Index position — #30 against #37 (60.0 vs 55.1 points).
  • API cost matters — $0.34/1M output tokens against $8.00/1M, about 23.5× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.10/1M against $2.00/1M.
  • you need the longer context window — 262K tokens against 200K.
  • you want to self-host: Gemma 4 31B ships open weights while o3 is api only.
  • you want provider choice — 16 listed API providers against 1.
  • Arena coding is your yardstick — 1499 against 1460.
  • you want the more recently listed model — Gemma 4 31B was listed 2 April 2026, o3 16 April 2025.

Choose o3 if…

  • Artificial Analysis Intelligence Index is your yardstick — 31.1 against 29.7.

Gemma 4 31B vs o3: specs, pricing and context

Specification comparison of Gemma 4 31B and o3
FieldGemma 4 31BGoogleo3OpenAI
ModelCap Index position#30#37
Index score60.055.1
EvidenceMeasuredMeasured
Input price / 1M tokens$0.10$2.00
Output price / 1M tokens$0.34$8.00
Context window262K tokens200K tokens
Max output tokens262K100K
API providers listed161
Weight accessOpen weightsAPI only
Input modalitiesImage, Text, VideoImage, Text, File
First listed2 April 202616 April 2025
PublisherGoogleOpenAI

Evidence: 5 public benchmark observations across 5 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 o3

Public benchmark boards where Gemma 4 31B or o3 has a published result
BoardGemma 4 31Bo3Leads
Arena codingArena (LMArena)14991483–151414601453–1466Gemma 4 31B
LMArena AgentLMArena-18.9%-21.7%–-16.0%—Only one result
ARC-AGI-2ARC Prize Foundation—6.5%HighOnly one result
SWE-benchSWE-bench (Princeton / SWE-agent team)—58.4%Only one result
BFCL V4UC Berkeley (Gorilla)—63.1PromptOnly one result
WildClawBench OpenClawWildClawBench37.6—Only one result
Artificial Analysis Intelligence IndexArtificial Analysis29.7intelligence-index31.1intelligence-indexo3

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 o3: common questions

Is Gemma 4 31B better than o3?

Gemma 4 31B ranks higher on the ModelCap Index as of 18 August 2026: #30 against #37. 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 Gemma 4 31B cheaper than o3?

Gemma 4 31B is cheaper on output tokens: $0.34/1M against $8.00/1M. Input tokens are $0.10/1M for Gemma 4 31B 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, Gemma 4 31B or o3?

Gemma 4 31B has the larger context window: 262K tokens against 200K.

Which is better for coding, Gemma 4 31B or o3?

Arena coding: Gemma 4 31B 1499, o3 1460 — Gemma 4 31B leads.

Are Gemma 4 31B and o3 open-weight models?

Gemma 4 31B: Open weights. 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 Gemma 4 31B and o3?

ModelCap currently lists 16 API providers for Gemma 4 31B 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 Gemma 4 31B vs o3 comparison?

Every figure comes from the sealed ModelCap dataset published 18 August 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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