# Gemini 2.5 Flash

Gemini 2.5 Flash is an AI model released by Google on Apr 17 2025. It has a 1M context window. Tracked results include 19% on BullshitBench v2.

## Facts

| Field | Value |
| --- | --- |
| Model | Gemini 2.5 Flash |
| Developer | Google |
| Release date | Thursday, Apr 17 2025 |
| Licensing | Closed |
| Context window | 1M |

## API pricing

All rates in USD per 1,000,000 tokens, pay-as-you-go.

| Tier | Input | Cached input | Output |
| --- | --- | --- | --- |
| Standard text/image/video | $0.30 | $0.03 | $2.50 |

Output prices include reasoning tokens.
Verified October 19, 2026 against the first-party source: https://ai.google.dev/gemini-api/docs/pricing

## Tracked benchmark scores

| Benchmark | Score | Source | What it measures |
| --- | --- | --- | --- |
| BullshitBench v2 | 19% | [BullshitBench](https://github.com/petergpt/bullshit-benchmark) | Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. |

## About Gemini 2.5 Flash

Gemini 2.5 Flash entered preview on April 17, 2025 as Google's hybrid reasoning model for workloads sensitive to response time and cost. Developers could enable or disable thinking, using the same model for quick responses or requests that benefited from additional reasoning.

The API also exposed a thinking budget that capped the tokens available for reasoning; it did not guarantee an exact number would be consumed. Google positioned Flash for high-volume applications, including customer support and document processing, alongside the larger 2.5 Pro model.

## Questions and answers

### When was Gemini 2.5 Flash released?

Gemini 2.5 Flash was released by Google on Thursday, Apr 17 2025.

### Who made Gemini 2.5 Flash?

Gemini 2.5 Flash was built by Google. Builds the Gemini family of models through Google DeepMind. Integrates AI across Google products.

### 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 Google API. Cached input is $0.03 per million tokens. Output prices include reasoning tokens. Rates are pay-as-you-go API prices verified against Google's published pricing on October 19, 2026.

### What benchmark scores did Gemini 2.5 Flash get?

Gemini 2.5 Flash reports 1 tracked benchmark score — BullshitBench v2: 19%. Tracked scores may come from lab reports or independent benchmarks; source details accompany the benchmark data.

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

Gemini 2.5 Flash has a context window of 1M. Providers may specify separate input and output token limits.

### Is Gemini 2.5 Flash open source?

No. Gemini 2.5 Flash is a closed model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.

### What came before and after Gemini 2.5 Flash?

Google's previous tracked release was Gemini 2.5 Pro on Mar 25 2025, 23 days earlier. It was followed by Gemini 2.5 Flash-Lite on Jun 17 2025.


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Canonical page: https://aireleasetracker.com/model/google/gemini-2.5-flash
Site index: https://aireleasetracker.com/llms.txt
Source: AI Release Tracker (https://aireleasetracker.com). Most benchmark scores come from lab launch material; gathered results identify the leaderboard that published them.