Models/Google/Gemini 3.1 Pro Preview

Gemini 3.1 Pro Preview

Live Pro sibling on the 19 Aug OpenRouter catalog. vals hero 41.90% ±1.17. AA page 404s. No official DeepSWE row. google/gemma-4-31b is not a live slug. This is the Pro the owner asked for instead.

01

Identity

1,048,576Context in
65,536Context out
2026-02-19 (OpenRouter created 1771509627)Released
ProprietaryWeights
Canonical name
Gemini 3.1 Pro Preview
Aliases
gemini-3.1-pro-preview, google/gemini-3.1-pro-preview
Continuum hosted id
Not listed as a Continuum hosted id
OpenRouter slug
google/gemini-3.1-pro-preview
Hugging Face
None (closed or unpublished)
Modalities
text, image
Closed weights Not on Continuum host list Vendor lab

Closed. OpenRouter catalog 19 Aug 2026: $2 / $12, cache read $0.20 /M, cache write $0.375 /M, web search $0.014/request, 1,048,576 / 65,536, created unix 1771509627.

google/gemma-4-31b is missing from that catalog. The live instruct SKU is google/gemma-4-31b-it. Hosted Google remains gemini-3.5-flash and gemma-4-31b-it:free.

02

Should I use this for coding agents

Use 3.1 Pro Preview when you want the live Google Pro sibling. The only published coding tile on this cluster is vals Accuracy 41.90% ±1.17. AA 404s. DeepSWE family notes name 3.6 / 3.7 Flash, not this Pro.

DeepSWE

No official DeepSWE mini-swe-agent row for this identity on the public board we fetched.

omitted, not invented as of 2026-08-13 source
Artificial Analysis

No Intelligence Index integer fetched for this identity. Chip omitted.

omitted, not invented as of 2026-08-19 source
Vals Indexvals.ai card
41.90%
bench
Vals Index
version
hero index
harness
vals.ai card
metric
Vals Index
value
41.90%
independent as of 2026-08-19 source

vals.ai Accuracy Rankings hero, 19 Aug 2026: 41.90% ±1.17. Only published coding tile for this SKU on this cluster.

Ranked view: Best coding models: the independent leaderboard puts this row and every other card that carries an independent coding score on one board, with the confidence intervals left visible.

Named benches, printed only

Copied from AA or vals HTML we opened. 0.0% placeholder bars are omitted. Do not average these into the hero tiles, and do not invent CI, $/task, or steps for Artificial Analysis.

BenchPrintedNoteSourceURLAs of
OpenRouter list pair $2 / $12 per 1M Catalog row. AA page 404s. OpenRouter catalog source 2026-08-19
03

When not to use it

Trust this before you buy

  • Need an AA Intelligence Index integer. https://artificialanalysis.ai/models/gemini-3.1-pro-preview 404s on 19 Aug.
  • Need official DeepSWE. The 13 Aug notes name Flash SKUs, not 3.1 Pro.
  • Wanted Gemma 4 31B. That exact slug is not live. Need hosted inference. Hosted Google is 3.5 Flash and Gemma 4 31B IT free.

Plus is $25/mo with $25 weekly hosted usage. The Mac app stays free with your own keys. Get Plus is not Download for Mac.

04

Artifact

Weights

Google does not publish 3.1 Pro Preview weights. No HF Files button.

  • OpenRouter catalog 19 Aug 2026: $2 / $12, cache read $0.20 /M, cache write $0.375 /M, web search $0.014 per call.
  • AA 404. Official DeepSWE board: no Pro row in the family notes we cite.

What you can open

Lab card and OpenRouter listing only. No Hugging Face Files button, because there is no official repo to point at.

Fetched OpenRouter catalog on 2026-08-19. hugging_face_id was empty.

05

Continuum serving

Not listed as a Continuum hosted id.

Continuum hosted id not on the host list

We list first-party and OpenRouter, plus Continuum only when the live public allowlist named the id. This is not a 15-host routing table.

06

Economics

OpenRouter catalog 19 Aug 2026: $2 / $12 per million. No DeepSWE $/task. No AA cost table: that page 404s.

Price this model Opens the pricing calculator preloaded with Gemini 3.1 Pro Preview.
07

Provenance

ClaimSourceAs of
OR catalog $2 / $12, cache $0.20 / $0.375 write, search $0.014, 1,048,576 / 65,536, created 1771509627OpenRouter catalog2026-08-19
vals Accuracy 41.90% ±1.17vals.ai Accuracy Rankings 2026-08-192026-08-19
AA /models/gemini-3.1-pro-preview 404Artificial Analysis2026-08-19
OpenRouter id google/gemini-3.1-pro-preview, context 1,048,576OpenRouter /api/v1/models2026-08-19
08

Compare, FAQ, and Get Plus

No other card in this cluster shares a published DeepSWE official row we can put next to this one. We will not compare on vendor-blog numbers.

Continue through Google's model family with Gemini 3.5 Flash.

FAQ

Why not Gemma 4 31B?

google/gemma-4-31b is not in the 19 Aug catalog. The owner asked for whichever of gemini-3.1-pro-preview or gemma-4-31b is live and leading. Pro is the live paid sibling.

Why does the lab blog disagree with DeepSWE or Scale?

Lab posts pick a harness, an effort, a split, and sometimes a private eval set. DeepSWE publishes the official mini-swe-agent row with cost, tokens, and steps. Scale SWE-bench Pro only counts when the public shared-harness board has a row we can fetch. A higher lab number is usually a different test, not a better one.

OpenAI-compatible call

No Continuum hosted id is verified for this model, so this page does not invent a curl target. Use the first-party API or the OpenRouter slug google/gemini-3.1-pro-preview.

Plus is $25/mo with $25 weekly hosted usage. The Mac app stays free with your own keys. Get Plus is not Download for Mac.