Gemini 3.7 Flash: price, context window, and caching
Launched as Google's coding and agent Flash, now the previous generation that Google keeps fully supported.
Released August 13, 2026 · Prices as of September 28, 2026
In Google’s words
“Our previous-generation Flash model for complex coding, agentic workflows, and reliable multi-step execution.”
Facts
Specs and prices
| Fact | Gemini 3.7 Flash |
|---|---|
| Maker | |
| API model id | gemini-3.7-flash |
| Released | August 13, 2026 |
| Status | Previous generation |
| Context window | 1.05M tokens |
| Max output | 65.5K tokens |
| Open weights | No |
| Input, per 1M tokens | $0.75 |
| Cache hit, per 1M | $0.075 |
| Cache write, per 1M | $0.75 (same as input) |
| Output, per 1M tokens | $3.75 |
| Runs in | OpenCode, OpenRouter, and GitHub Copilot |
Standard API rates in US dollars, as published by the maker on September 28, 2026. Batch and priority tiers, taxes, and subscription plans are not included. Gemini 3.7 Flash: Introductory rates through December 31, 2026. From January 1, 2027: $1.50 input, $0.15 cached, and $7.50 output per million tokens.
Good to know
- Not in Gemini CLI's model list or Cursor's. Available through OpenRouter and OpenCode.
Cost
What typical work costs
Example token counts at Gemini 3.7 Flash’s published rates. On the agentic session, caching saves $1.35 against billing every token as ordinary input.
| Agentic coding session, 100K input, 400K written to cache, 2M read from cache, 50K output | $0.71 |
|---|---|
| Large one-off review, 150K input with no cache hits, 10K output | $0.15 |
| Output-heavy generation, 30K input, 80K output | $0.32 |
| A month of sessions, 110 sessions: 5 a day, 22 working days | $78.38 |
Prompt caching
How Google bills cached tokens
Implicit caching is on by default for Gemini 2.5 and newer. When a request repeats a prefix Google has cached, the discount is applied automatically, but a hit is not guaranteed.
Explicit caching creates a cache you reference by name, with a guaranteed discount. It adds a storage charge for as long as the cache lives, 1 hour by default: $4.50 per million tokens per hour on Pro models and $0.50 to $1 on Flash models.
On every model compared here, a cache hit costs 10% of the input price. Google publishes no separate cache-write price, so this blog prices written tokens as ordinary input.
Source: Google: Context caching
Gemini 3.7 Flash compared
Gemini 3.7 Flash vs Gemini 3.6 Flash
Gemini 3.7 Flash and Gemini 3.6 Flash cost the same and are both previous-generation. How Google pitched each, and the GitHub Copilot date to know.
Gemini 3.8 Flash vs Gemini 3.7 Flash
Gemini 3.8 Flash and Gemini 3.7 Flash cost the same, and both rates double on January 1, 2027. What differs is Gemini CLI, Cursor, and Google's own pitch.
Your own numbers
See what Gemini 3.7 Flash really costs you.
everyaitoken reads your OpenCode and OpenRouter history on your Mac and prices every request at API rates, with what caching saved or cost. $9 once.