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.
Last updated: 2026-06-27. Full catalog. Reference prices are dated snapshots. Compare total cost and measured task quality before choosing a route.
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.
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.
Step 3.5 Flash is the openrouter SKU in this catalog. Compare same-provider siblings before jumping labs.
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.
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.
Step 3.5 Flash supports a 262K tokens context window in the gateway catalog snapshot. Context limits may vary by fulfillment host endpoint.
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.
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.
Step 3.5 Flash in the o10 unified catalog.
| Field | Value |
|---|---|
| o10 slug | `step-3.5-flash` |
| Type | text |
| Band | C2 |
| Routable | Yes |
| Source provider | openrouter |
| Primary host | Together AI |
| Gateway ID | `stepfun/step-3.5-flash` |
| Context window | 262,114 tokens |
| Released | 2026-01-29 |
Gateway snapshot pricing for Step 3.5 Flash.
| Unit | Price |
|---|---|
| Input | $0.09/1M tokens |
| Output | $0.3/1M tokens |
Upstream venues configured for Step 3.5 Flash.
| Host | Upstream model ID |
|---|---|
| stepfun | together_ai/step-3.5-flash |
Endpoint-level pricing and latency from the gateway catalog.
| Provider | Input ($/1M) | Latency p50 | Uptime 1d |
|---|---|---|---|
| deepinfra | $0.09 | 193ms | 10000.0% |
Eval-gated model selection for this slug.
o10 slug: step-3.5-flash. Band: C2. Routable: yes.
See [/models/routing](/models/routing) for smart aliases (o10/auto, o10/frontier, o10/squad) and [/kyi](/kyi) for governance.
Fulfillment catalog 2026-06-27. Gateway pricing joined where slug match exists.
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.
Step 3.5 Flash supports 262K tokens in the gateway catalog snapshot. Host-specific endpoints may differ.
Step 3.5 Flash (step-3.5-flash) is configured on: Together AI. Upstream model IDs are listed in the fulfillment routes section.
Yes. Step 3.5 Flash is routable at band C2. Send model: "step-3.5-flash" or use an o10 smart routing alias.
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.
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.