# Step 3.5 Flash 2603 Usage, Cost & Rank | OpenCode Data

> Step 3.5 Flash 2603 costs $0.10 per 1M input tokens and $0.30 per 1M output tokens.

StepFun flash model for efficient multimodal reasoning, coding, and tool use

- Page: https://opencode.ai/data/stepfun/step-3-5-flash-2603
- JSON: https://opencode.ai/data/stepfun/step-3-5-flash-2603.json
- Model ID: stepfun/step-3.5-flash-2603
- Lab: StepFun

## Model facts

| Fact | Value |
| --- | --- |
| Context window | 256K |
| Max output | 256K |
| Knowledge cutoff | 2025-01 |
| Release date | 2026-04-02 |
| Input modalities | text |
| Output modalities | text |
| Reasoning | Yes |
| Tool calling | Yes |
| Open weights | Yes |
| Weights | [Hugging Face](https://huggingface.co/stepfun-ai/Step-3.5-Flash) |

## Pricing: USD per 1M tokens

| Input | Output | Cached input | Cache write |
| --- | --- | --- | --- |
| $0.10 | $0.30 | $0.02 | - |

## Benchmarks

| Benchmark | Score | Metric | Source |
| --- | --- | --- | --- |
| Artificial Analysis Coding Index | 34.6 | index | https://openrouter.ai/stepfun/step-3.5-flash/benchmarks |
| SciCode | 38.5 | percent correct | https://openrouter.ai/stepfun/step-3.5-flash/benchmarks |
| Terminal-Bench Hard | 32.6 | success rate | https://openrouter.ai/stepfun/step-3.5-flash/benchmarks |

## 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.