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Head to head · prices checked 22 September 2026

Claude Opus 5 vs Gemini 3.1 Pro (preview)

A common premium choice for writing and analysis, where Gemini costs well under half. Both list prices from the makers’ own pages, and what three everyday jobs cost on each.

What a job costsEvery model

US dollars, standard rate, shortest context band. Price only: this page does not rank quality.

1,000 support replies
2.3×what Claude Opus 5 costs next to Gemini 3.1 Pro (preview)
Claude Opus 5
$25.00
Gemini 3.1 Pro (preview)
$10.80
Claude Opus 5, per M tokens
$5 / $25
Gemini 3.1 Pro (preview), per M tokens
$2 / $12

3,000 tokens in and 400 out each, at list price.

Per million tokens, Claude Opus 5 costs $5 in and $25 out; Gemini 3.1 Pro (preview) costs $2 in and $12 out. 1,000 support replies cost $25.00 on Claude Opus 5 and $10.80 on Gemini 3.1 Pro (preview), so Claude Opus 5 costs 2.3 times as much.

Side by side

Each maker’s published rate for its standard tier. Cached input is what a repeated prompt prefix costs once the provider has stored it.

Claude Opus 5 and Gemini 3.1 Pro (preview): list prices and specifications
FactClaude Opus 5Gemini 3.1 Pro (preview)
MakerAnthropicGoogle
TierFlagshipsFlagships
Input, per M tokens$5.00$2.00
Output, per M tokens$25.00$12.00
Cached input$0.50$0.20
Context window1M1.05M
Released24 Jul 202619 Feb 2026
WeightsClosedClosed

What a job costs on each

1,000 runs of each job at the two list prices. The gap moves from job to job because the models price input, output and cached context differently.

Cost of 1,000 runs of three jobs on Claude Opus 5 and Gemini 3.1 Pro (preview)
JobClaude Opus 5Gemini 3.1 Pro (preview)Cheaper
Support reply3,000 in, 400 out.$25.00$10.80Gemini 3.1 Pro (preview), 57% less
Document summary25,000 in, 1,000 out.$150$62.00Gemini 3.1 Pro (preview), 59% less
Agent task80,000 in (70,000 cached), 3,000 out.$160$70.00Gemini 3.1 Pro (preview), 56% less

The token counts are ours, chosen to look like real work; the prices are the makers’. A model with no published cache price bills the agent task’s repeated context at its full input rate.

The small print

What each base rate leaves out, from the makers’ own pages: surcharges, discounts, promotions and cache pricing.

Claude Opus 5
Cache write $6.25 (5 min) or $10 (1 h). Fast mode $10 / $50. Batch API 50% off. US-only inference (inference_geo) bills 1.1x. Full context window billed at standard rates. Anthropic’s pricing page
Gemini 3.1 Pro (preview)
Preview model, but Google has no GA 3.x Pro and it is widely used. Prompts above 200K tokens: $4 / $18, cached $0.40. Cache storage $4.50 per MTok per hour. Batch 50% off. Max output 65,536. Google’s pricing page

Other comparisons

Every head to head on the list that involves Claude Opus 5 or Gemini 3.1 Pro (preview).

Run Claude Opus 5 for a quarter of list price

AIGROW API credit covers Claude Opus 5 and is metered at the list prices above: $25 buys $100 of usage.

See API creditCompare every model

Prices checked 22 September 2026