Source page: https://www.o10.io/models/step-3.5-flash

Plain-text reference for reading, copying, and citation. Examples are illustrative; use your own credentials for API requests.

Model data: https://www.o10.io/api/models.json
Content index: https://www.o10.io/llms.txt
Prices are dated references, not live quotes. Check the current endpoint rate before use.

# Step 3.5 Flash. Price, context, and routing

Step 3.5 Flash costs $0.090/1M input tokens and $0.300/1M output tokens as of 2026-06-27. Openrouter publishes this model with a 262K tokens context window. o10 lists Step 3.5 Flash on Together AI at routing band C2. API slug step-3.5-flash. Verify list prices against the venue you call.

## Key takeaways

### What is Step 3.5 Flash?

Step 3.5 Flash is a chat model from openrouter (slug: step-3.5-flash). Pick Step 3.5 Flash when your evals pass at band C2 and the fulfillment hosts below are allowed venues. Published input pricing starts at $0.090/1M tokens. Context window: 262K tokens.

*Catalog snapshot 2026-06-27.*

### When should you pick Step 3.5 Flash?

Pick Step 3.5 Flash when your evals pass at band C2 and the fulfillment hosts below are allowed venues. Step 3.5 Flash is the openrouter SKU in this catalog. Compare same-provider siblings before jumping labs.

### How does Step 3.5 Flash differ from sibling models?

Step 3.5 Flash is the openrouter SKU in this catalog. Compare same-provider siblings before jumping labs.

### How much does Step 3.5 Flash cost per million tokens?

Step 3.5 Flash costs $0.090/1M input tokens and $0.300/1M output tokens in the gateway catalog snapshot (2026-06-27). Endpoint pricing may differ by fulfillment host.

*Sourced from gateway catalog snapshot.*

### Where can you run Step 3.5 Flash?

Step 3.5 Flash is configured on Together AI. Known host IDs: stepfun: together_ai/step-3.5-flash. This model is routable through o10 eval-gated routing.

### What is Step 3.5 Flash's context window?

Step 3.5 Flash supports a 262K tokens context window in the gateway catalog snapshot. Context limits may vary by fulfillment host endpoint.

### What o10 routing band is Step 3.5 Flash?

Step 3.5 Flash is classified at o10 routing band C2. Bands group models by cost tier and eval profile: C0 (economy), C1 (standard), C2 (capable), C3/C4 (frontier). Production routing is enabled for this slug.

### Who makes Step 3.5 Flash?

Step 3.5 Flash is attributed to source provider openrouter in the o10 catalog. Fulfillment hosts (Together AI) supply API access; list pricing may differ by venue.

## Citation
Step 3.5 Flash costs $0.090/1M input tokens and $0.300/1M output tokens as of 2026-06-27. Openrouter publishes this model with a 262K tokens context window. o10 lists Step 3.5 Flash on Together AI at routing band C2. API slug step-3.5-flash. Verify list prices against the venue you call.
## Methodology

Fulfillment catalog 2026-06-27. Gateway pricing joined where slug match exists.

## FAQ

### How much does Step 3.5 Flash cost?

Step 3.5 Flash costs $0.090/1M input tokens and $0.300/1M output tokens in the gateway snapshot (2026-06-27). Verify against your provider's published pricing.

### What is Step 3.5 Flash's context window?

Step 3.5 Flash supports 262K tokens in the gateway catalog snapshot. Host-specific endpoints may differ.

### Which hosts serve Step 3.5 Flash?

Step 3.5 Flash (step-3.5-flash) is configured on: Together AI. Upstream model IDs are listed in the fulfillment routes section.

### Is Step 3.5 Flash routable through o10?

Yes. Step 3.5 Flash is routable at band C2. Send model: "step-3.5-flash" or use an o10 smart routing alias.

### How do I call Step 3.5 Flash via o10?

Use o10 slug "step-3.5-flash" or gateway ID "stepfun/step-3.5-flash" depending on your integration. Gateway-compatible endpoints accept OpenAI-style /v1 requests.

### How does o10 route this model?

o10 routes Step 3.5 Flash only when per-use-case evals clear at your quality floor. Band C2 indicates cost tier. See /kyi for governance and /models/routing for smart aliases.

## Related links

- [Step 3.5 Flash HTML](https://www.o10.io/models/step-3.5-flash)
- [Step 3.5 Flash pricing](https://www.o10.io/pricing/openrouter/step-3.5-flash)
- [Model catalog](https://www.o10.io/models)
- [llms-models.txt](https://www.o10.io/llms-models.txt)

## Source URL

https://www.o10.io/models/step-3.5-flash