3.7 Flash or Sonnet 5
Intro rate vs a locked $2/$10
Both are callable on QCode: gemini-3.7-flash and claude-sonnet-5. 3.7 official intro is $0.75 / $3.75 through 31 Dec 2026, then $1.50 / $7.50. Sonnet 5 confirmed $2 / $10 as standard on 10 Aug 2026 (the planned Sep $3 / $15 was cancelled). This page does not invent independent head-to-heads.
What actually compares
vs $2 / $10
3.7 is an intro rate through 31 Dec 2026; from 1 Jan 2027 it is $1.50 / $7.50. Sonnet 5’s $2 / $10 is now standard. Google’s own launch table also lists Sonnet 5 at $2 / $10 — label that vendor.
vs 1M / 128K
Official 3.7 Flash: 1,048,576 in, 65,536 out. Sonnet 5: 1M context, 128K out. Same order of window; Sonnet allows a larger completion.
vs Sonnet thinking
Those are 3.7’s thinking levels. Officially, minimal errors. Do not paste these names onto Sonnet 5.
Both on /models
gemini-3.7-flash and claude-sonnet-5 are listed. Same endpoint, switch the model field. Live list wins.
What we are comparing
A Flash workhorse against Claude’s mid-tier default. Six weeks apart: Sonnet 5 on 30 Jun 2026, 3.7 Flash on 13 Aug 2026. Price, window, output cap and thinking controls line up with official docs. Independent head-to-head reruns are not invented here.
Google’s own comparison table
The DeepMind model card / launch table lists Claude Sonnet 5 at $2 in / $10 out and prints vendor figures (DeepSWE v1.1: 3.7 at 65.3% vs Sonnet 5 at 53.8%; FrontierCode 1.1 Main: 43.6% vs 42.7%). Those rows are Google’s table, not a rerun on this site, not an independent rank. Sonnet 5 at $2 / $10 matches what Anthropic confirmed as standard on 10 Aug 2026.
Timeline
Claude Sonnet 5 ships. 1M / 128K.
Anthropic confirms $2 / $10 as standard. Planned 1 Sep $3 / $15 is cancelled. See /claude-sonnet-5-pricing.
Gemini 3.7 Flash GA. Intro $0.75 / $3.75 through 31 Dec 2026. Google’s table includes Sonnet 5 at $2 / $10.
Confirmed vs do not invent
Confirmed
Both ids are in official docs and on QCode /models. 3.7 intro $0.75 / $3.75 through 31 Dec 2026, then $1.50 / $7.50. Sonnet 5 standard $2 / $10. Windows and output caps as above. Google’s launch table lists Sonnet 5 at $2 / $10.
Do not invent
Do not publish a homemade “independent bake-off.” The scores above are Google’s table and must be labeled vendor. Do not annualize 3.7’s intro rate. Do not still write that Sonnet 5 jumps to $3 / $15 in September.
When to pick which
Pick 3.7 Flash
You want the lower list price, Flash-class throughput, official low / medium / high, and you can live with the 1 Jan 2027 double and a 65,536 output cap.
Pick Sonnet 5
You want the Claude stack, 128K out, a standard $2 / $10 that is no longer a promo, or a workflow only validated on Sonnet.
One key, swap the id
On QCode set model to gemini-3.7-flash or claude-sonnet-5. For 3.7 use low / medium / high — not minimal. For Sonnet 5 use Anthropic’s own thinking interface; do not reuse Google’s level names.
On QCode
Both ids are on /models: gemini-3.7-flash and claude-sonnet-5. Category is comparison: same endpoint, switch. Billing is each vendor’s official list × our service rate. Live list wins.
3.7 Flash vs Sonnet 5 FAQ
Which is cheaper?
List: 3.7 intro $0.75 / $3.75, Sonnet 5 standard $2 / $10. From 1 Jan 2027, 3.7 becomes $1.50 / $7.50. Real bills still depend on completion length and thinking tokens.
How different is the window?
3.7: 1,048,576 in, 65,536 out. Sonnet 5: 1M context, 128K out. Input is the same order; Sonnet allows a larger completion.
Who wins at coding?
We do not invent an independent rank. Google’s own table prints DeepSWE v1.1 65.3% vs 53.8% and FrontierCode 1.1 43.6% vs 42.7%. Label those vendor.
Can I call both on QCode?
Yes. Both ids are listed. Same endpoint, change model.
How do I set thinking?
3.7: low / medium / high; minimal errors. Sonnet 5 uses Anthropic’s own thinking interface — do not paste these three names onto it.
What should be the default?
Stay on Sonnet 5 if the workflow is already locked to Claude. Try 3.7 if you want the Flash list price and can accept a 65,536 output cap. Regress first; do not trust the vendor table alone.
Sources
Google Keyword / DeepMind model card, 13 Aug 2026 (vendor table listing Sonnet 5 at $2 / $10); Gemini API pricing; Anthropic Sonnet 5 docs and the 10 Aug 2026 standard-price confirmation, see /claude-sonnet-5-pricing.
Want both? Change the model field
gemini-3.7-flash and claude-sonnet-5 are both listed.
Related
3.7 Flash guide
Specs, intro rate, how to call it.
Claude Sonnet 5
Mid-tier default. 1M / 128K, $2 / $10.
Sonnet 5 vs GPT-5.6 vs Gemini 3
The three-way page. A different table.
Not affiliated with Google or Anthropic. Vendor tables are not independent reruns. Prices follow each vendor’s docs and /models.