# Gemini 2.5 Flash

Gemini 2.5 Flash is a text generation model from Google, available through the Impossibl API. Its published context window is 1,000,000 tokens. The advertised input rate is $0.30 per million input tokens. The advertised output rate is $2.50 per million output tokens.

- Model identifier: ` google/gemini-2.5-flash `
- Creator: Google
- Model type: Text generation
- Canonical model page: [Gemini 2.5 Flash](<https://impossibl.com/google/gemini-2.5-flash>)
- API availability: Listed as serving through Impossibl.
- Creator release date: 2025-06-17

## Capabilities and limits

- Context window: 1,000,000 tokens
- Maximum output tokens: Not published in the public catalog; this is separate from the context window.
- Inputs: text, image, audio, video
- Outputs: text
- Tool calling: Not published

## API access

Use ` google/gemini-2.5-flash ` as the model identifier through the Impossibl API.

Published API endpoints:

- ` /v1/chat/completions `

[API quickstart](<https://impossibl.com/docs/agent-quickstart>) · [Models and billing documentation](<https://impossibl.com/docs/models>)

## Published API prices

All rates are in USD. An unpublished rate is unknown, not zero. Workspace-specific pricing, taxes, balance-purchase fees, billing adjustments, and tool charges can affect the amount paid.

| Usage | Published base rate | Billing unit |
| --- | --- | --- |
| Input | $0.30 | per million input tokens |
| Output | $2.50 | per million output tokens |
| Cache read | $0.03 | per million cached input tokens |
| Cache write (default retention) | Not published | per million tokens |
| Cache write (one-hour retention) | Not published | per million tokens |
| Audio input | $1.00 | per million audio input tokens |

## Independent benchmarks

Source: [Artificial Analysis](<https://artificialanalysis.ai/>). Last checked: 2026-09-11T11:21:18.106Z.
Configurations are evaluated separately. API scores retain their original units. Unmeasured scores are omitted.

### Gemini 2.5 Flash (Non-reasoning)

Source: [Evaluation source](<https://artificialanalysis.ai/models/gemini-2-5-flash>)

| Benchmark | Score |
| --- | --- |
| Intelligence Index | 9.85 |
| Omniscience Index | -42.57 |
| GPQA | 68.28% |
| Humanity’s Last Exam | 4.73% |
| CritPt | 1.43% |
| Terminal-Bench Hard | 12.12% |
| AA-LCR | 49.90% |
| Multilingual LCR | 8.33% |
| MMMU-Pro | 65.49% |
| IFBench | 38.98% |
| Tau2 | 14.91% |
| LiveCodeBench | 49.52% |
| AIME 2025 | 60.33% |
| intelligence index (API) | 9.9 |

### Gemini 2.5 Flash (Reasoning)

Source: [Evaluation source](<https://artificialanalysis.ai/models/gemini-2-5-flash-reasoning>)

| Benchmark | Score |
| --- | --- |
| Intelligence Index | 13.11 |
| Omniscience Index | -29.80 |
| GPQA | 78.99% |
| Humanity’s Last Exam | 12.14% |
| CritPt | 1.14% |
| Terminal-Bench Hard | 13.64% |
| AA-LCR | 65.33% |
| Multilingual LCR | 8.89% |
| MMMU-Pro | 69.08% |
| IFBench | 50.27% |
| Tau2 | 31.58% |
| LiveCodeBench | 69.52% |
| AIME 2025 | 73.33% |
| intelligence index (API) | 13.1 |

Full benchmark data and breakdowns: [Complete benchmark snapshot](<https://api.impossibl.com/v1/models/google/gemini-2.5-flash/benchmarks>).


## Availability and retirement

The model is listed as serving. No retirement is announced in the current public catalog.

## Frequently asked questions

### What is Gemini 2.5 Flash?

Gemini 2.5 Flash is a text-generation model from Google, available through the Impossibl API.

### How much does Gemini 2.5 Flash cost?

Gemini 2.5 Flash costs $0.30 per million input tokens and $2.50 per million output tokens through the Impossibl API. Cache reads cost $0.03 per million tokens. Audio input costs $1.00 per million audio input tokens. All rates are in USD.

### What is the context length of Gemini 2.5 Flash?

Gemini 2.5 Flash has a 1,000,000-token context window through the Impossibl API.

### What inputs and outputs does Gemini 2.5 Flash support?

Gemini 2.5 Flash accepts text, image, audio, and video as input. Gemini 2.5 Flash returns text.

### How do I use Gemini 2.5 Flash through an API?

Gemini 2.5 Flash is available through the Impossibl API. Use google/gemini-2.5-flash as the model identifier with /v1/chat/completions. The quickstart explains how to create an API key and send your first request.

### When was Gemini 2.5 Flash released?

Google released Gemini 2.5 Flash on June 17, 2025.

Sources: [Creator release announcement](<https://ai.google.dev/gemini-api/docs/changelog>)

## Sources and related links

Prices, limits, capabilities, endpoints, and availability come from the public Impossibl catalog. Creator documentation supplies descriptions and release dates where available; it does not override the published API offering.

- [Public Impossibl model catalog](<https://api.impossibl.com/v1/models>)
- [Full model directory as JSON](<https://impossibl.com/models.json>)
- [Gemini 2.5 Flash: model details and pricing](<https://impossibl.com/google/gemini-2.5-flash>)
- [Model directory](<https://impossibl.com/models>)