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Head to head · prices checked 22 September 2026

Claude Sonnet 5 vs Gemini 3.8 Flash

Anthropic's workhorse against Google's, where Flash stays cheaper even after its 2027 price rise. 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
2.7×what Claude Sonnet 5 costs next to Gemini 3.8 Flash
Claude Sonnet 5
$10.00
Gemini 3.8 Flash
$3.75
Claude Sonnet 5, per M tokens
$2 / $10
Gemini 3.8 Flash, per M tokens
$0.75 / $3.75

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

Per million tokens, Claude Sonnet 5 costs $2 in and $10 out; Gemini 3.8 Flash costs $0.75 in and $3.75 out. 1,000 support replies cost $10.00 on Claude Sonnet 5 and $3.75 on Gemini 3.8 Flash, so Claude Sonnet 5 costs 2.7 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 Sonnet 5 and Gemini 3.8 Flash: list prices and specifications
FactClaude Sonnet 5Gemini 3.8 Flash
MakerAnthropicGoogle
TierWorkhorsesWorkhorses
Input, per M tokens$2.00$0.75
Output, per M tokens$10.00$3.75
Cached input$0.20$0.075
Context window1M1.05M
Released30 Jun 20262 Sep 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 Sonnet 5 and Gemini 3.8 Flash
JobClaude Sonnet 5Gemini 3.8 FlashCheaper
Support reply3,000 in, 400 out.$10.00$3.75Gemini 3.8 Flash, 63% less
Document summary25,000 in, 1,000 out.$60.00$22.50Gemini 3.8 Flash, 63% less
Agent task80,000 in (70,000 cached), 3,000 out.$64.00$24.00Gemini 3.8 Flash, 63% 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 Sonnet 5
The introductory $2 / $10 price became the standard price; the planned rise to $3 / $15 was cancelled. Cache write $2.50 (5 min) or $4 (1 h). Batch API 50% off. US-only inference (inference_geo) bills 1.1x. Full context window billed at standard rates. Anthropic’s pricing page
Gemini 3.8 Flash
Launch price through 2026-12-31; from 2027-01-01 it becomes $1.50 / $7.50, cached $0.15. Batch and Flex 50% off; Priority $1.35 / $6.75. Cache storage $0.50 per MTok per hour (rising to $1.00). Google’s pricing page

Other comparisons

Every head to head on the list that involves Claude Sonnet 5 or Gemini 3.8 Flash.

Run both for a quarter of list price

AIGROW API credit covers Claude Sonnet 5 and Gemini 3.8 Flash and is metered at the list prices above: $25 buys $100 of usage.

See API creditCompare every model

Prices checked 22 September 2026