# Claude Sonnet 5.5 vs Gemini 3.8 Flash - AI Model Comparison

- Page: https://opencode.ai/data/compare/anthropic/claude-sonnet-5-5/google/gemini-3-8-flash
- Updated: 2026-09-28T12:09:39.000Z

|  | Claude Sonnet 5.5 | Gemini 3.8 Flash |
| --- | --- | --- |
| Lab | Anthropic | Google |
| Context window | 1M | 1M |
| Max output | 128K | 66K |
| Input modalities | text, image, pdf | text, image, video, audio, pdf |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Open weights | No | No |
| Release date | 2026-09-28 | 2026-09-02 |
| Input price per 1M tokens | $2.00 | $0.75 |
| Output price per 1M tokens | $10.00 | $3.75 |
| Cached input price per 1M tokens | $0.20 | $0.07 |
| OpenCode tokens: past 2 months | - | 0 |
| Share of all tokens | - | 0% |
| Rank by tokens last week | - | - |
| Unique users | - | 0 |
| Weekly retention | - | - |

Model pages: [Claude Sonnet 5.5](https://opencode.ai/data/anthropic/claude-sonnet-5-5.md), [Gemini 3.8 Flash](https://opencode.ai/data/google/gemini-3-8-flash.md)

## Methodology

- Updates: Aggregated every hour. Days and weeks use UTC.
- Tokens: Input, output, reasoning, and cached tokens for each request.
- Users and sessions: Approximate counts of distinct users and OpenCode sessions.
- Cost: Session cost is the average cost per OpenCode session. Token prices are list prices from the OpenCode model catalog.
- Retention: The share of a model's users in one week who use it again the next week.
- Citation: Cite OpenCode Data (opencode.ai/data) with the update time shown at the top of the page.