Gemini 2.5 Flash
Gemini 2.5 Flash is Google's state-of-the-art workhorse model, specifically designed for advanced reasoning, coding, mathematics, and scientific tasks. It includes built-in "thinking" capabilities, enabling it to provide responses with greater accuracy and nuanced context handling. Additionally, Gemini 2.5 Flash is configurable through the "max tokens for reasoning" parameter, as described in the documentation (https://openrouter.ai/docs/use-cases/reasoning-tokens#max-tokens-for-reasoning).
Context window
This model accepts 1M tokens in one request (~750K words of text).
What fits in one request
- FitsShort documentAbout 1,500 words of text
- FitsLong documentAbout 37K words of text
- FitsSmall codebaseAbout 150K words of text
- FitsFull novelAbout 375K words of text
Specifications
Context size, pricing, and release info in one place.
- Context window
- 1,000,000 tokens (1M)
- Max output tokens
- 1,000,000 tokens (1M)
- Speed tier
- fast
- Provider
- Model family
- Gemini 2
- Release date
- Jun 2025
- Input cost
- $0.300/M / 1M tokens
- Output cost
- $2.50/M / 1M tokens
Capabilities
See which features this model supports, such as vision, tools, and streaming.
- Vision
- Accepts image inputs alongside text
- Supported
- Tool use
- Can call external tools and APIs
- Supported
- Function calling
- Structured function call interface
- Supported
- Extended thinking
- Shows its chain-of-thought reasoning
- Supported
- Streaming
- Returns tokens as they are generated
- Supported
- Prompt caching
- Reuse repeated prompt prefixes cheaply
- Supported
- Web search
- Can browse the web during a request
- Not supported
- Batch API
- Process many requests asynchronously
- Not supported
Best for
Jump to a guide or ranking that matches each workload.
Compare Gemini 2.5 Flash
Open a side-by-side comparison with one click.
- Gemini 2.5 Flash vs Gemma 7b It
Gemini 2.5 Flash has 12107% larger context window
- Gemini 2.5 Flash vs Amazon Titan Text Express
Gemini 2.5 Flash has 2280% larger context window
- Gemini 2.5 Flash vs Amazon Titan Text Lite
Gemini 2.5 Flash has 2280% larger context window
- Gemini 2.5 Flash vs Amazon Titan Text Premier
Gemini 2.5 Flash has 2280% larger context window
- Gemini 2.5 Flash vs Claude Instant
Gemini 2.5 Flash has 900% larger context window
- Gemini 2.5 Flash vs Anthropic Claude
Gemini 2.5 Flash has 900% larger context window
Frequently asked questions
Short answers about context size and how this model behaves.
More from Google
Other models by Google in our catalog.
Powered by Mem0
Use a smaller model.
Get better results.
Mem0 gives your AI long-term memory so you stop re-sending context on every call. That means you can use a smaller, faster, cheaper model — and still get better answers.
Example: a multi-turn chat session
80% less to send — works with any model