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ModelsStepFunStep 3.5 Flash

Step 3.5 Flash

stepfun/step-3.5-flash262k context Compare →
MedianThe median blended price among comparable offers: one price per provider (its cheapest route), standard tier, current prices only. Priority tiers and prices converted from points are not counted.
$0.15
Most expensiveThe highest blended price among comparable offers: one price per provider (its cheapest route), standard tier, current prices only. Priority tiers and prices converted from points are not counted.
$0.15
Offers
12
Providers
10

Cheapest right now

Featherless

directYou buy access straight from the company that runs the model on its servers. · 262k

$0.15 blended / 1M tokens

No change7D
in
$0.10
out
$0.30
Cached input
–
Go to offer Go to offer at Featherless (opens in a new tab)at Featherless

Public leaderboards

  • Text Arena, style controlThe series the source publishes by default for text since 16 May 2025: ranks corrected for the style of the answers (style control). #165 of 419Best rank in the source's rank spread, 165th to 190th, given the confidence intervals of all ranked models. 174th by score. 1,393 1,389 to 1,397Arena Score · 60,305 votes

Source: Arena (opens in a new tab) · Data under the CC BY 4.0 license (creativecommons.org/licenses/by/4.0) · CC BY 4.0 (opens in a new tab) · scores and ranks as published on 28 Oct 2026; the presentation is ours

Step 3.5 Flash costs from $0.15 per million tokens (at a 3:1 input:output mix): the lowest current price, at 6 providers, checked on ; 12 offers are listed.

Listed offers, by price

Comparable offersOther offersSolid steps are comparable offers; dashed steps are the other offers, which are not counted in cheapest, median or most expensive.

Offers not counted in cheapest, median or most expensive (6)

  • $0.143 · DeepInfra via Eden AI · cannot be designated the cheapest
  • $0.15 · SiliconFlow via Kilo Gateway · cannot be designated the cheapest
  • $0.15 · Glama via Glama · cannot be designated the cheapest
  • $0.15 · Martian via Martian · cannot be designated the cheapest
  • $0.15 · Nous Portal via Nous Portal · cannot be designated the cheapest
  • $0.158 · ShengSuanYun via ShengSuanYun · cannot be designated the cheapest

Cheapest that confirms no training on your prompts. The provider's published policy: prompts are not used for training.

$0.15 blended / 1M tokens

in
$0.10
out
$0.30
Cached input
$0.02
See pricing See pricing at EmpirioLabs AI (opens in a new tab)via EmpirioLabs AI

Price historyThe cheapest offer each day, against the lab's official list price when it publishes one. Each day at 00:00 UTC, the offer the API would have selected as the cheapest, with the same exclusions as /cheapest. Blended price, promotions included.

Cheapest offer and official list price, by day, 30 days
DayCheapest offerOfficial list price
2026-10-02$0.143, DeepInfra–
2026-10-03$0.143, DeepInfra–
2026-10-04$0.143, DeepInfra–
2026-10-05$0.143, DeepInfra–
2026-10-06$0.143, DeepInfra–
2026-10-07$0.143, DeepInfra–
2026-10-08$0.143, DeepInfra–
2026-10-09$0.143, DeepInfra–
2026-10-10$0.143, DeepInfra–
2026-10-11$0.143, DeepInfra–
2026-10-12$0.143, DeepInfra–
2026-10-13$0.143, DeepInfra–
2026-10-14$0.143, DeepInfra–
2026-10-15$0.143, DeepInfra–
2026-10-16$0.143, DeepInfra–
2026-10-17$0.143, DeepInfra–
2026-10-18$0.143, DeepInfra–
2026-10-19$0.15, Featherless–
2026-10-20$0.15, Featherless–
2026-10-21$0.15, Featherless–
2026-10-22$0.15, Featherless–
2026-10-23$0.15, Featherless–
2026-10-24$0.15, Featherless–
2026-10-25$0.15, Featherless–
2026-10-26$0.15, Featherless–
2026-10-27$0.15, Featherless–
2026-10-28$0.15, Featherless–
2026-10-29$0.15, Featherless–
2026-10-30$0.15, Featherless–
2026-10-31$0.15, Featherless–

Cheapest offer

Offers

12 of 12 offers

Offers for Step 3.5 Flash, one row per offer, sorted by blended price.
RankProvider · viaYou buy access through an aggregator: one account and one API that forward your requests to other providers. "Via" names the aggregator; the price is the one it charges you. When "via" says "hosted API", no aggregator is involved: the model belongs to a lab and another provider sells it.Input $/1MOutput $/1MBlended $/1MA single price that mixes input and output: 3 input tokens for 1 output token, per million tokens. It makes offers easy to rank; your real cost depends on your own mix.PrecisionHow finely the model's numbers are stored on the provider's servers. Lower precision (fp8, fp4) is cheaper to run and can slightly change answer quality; "unknown" means the provider doesn't say. ContextThe maximum amount of text, counted in tokens, the model can take in and write in a single request. Past this limit, the request is refused or cut.ConditionsWhat a provider says about how it handles your data and who can sign up: training on prompts, processing region, sign-up requirements. Each comes from the provider's published documents; when nothing is published, it stays unknown.SignalsOffer
1 DeepInfravia Eden AI 0.09  0.30  0.143 – 262k United States Unverified. No public page for this offer: listed, not designated cheapest
: Eden AI (opens in a new tab). No public price page for this model
2 Featherless 0.10  0.30  0.15  – 262k
Go to offer at Featherless (opens in a new tab)
3 EmpirioLabs AI 0.10  0.30  0.15  – 262k
See pricing at EmpirioLabs AI (opens in a new tab)
4 NanoGPT 0.10  0.30  0.15  – 262k
Go to offer at NanoGPT (opens in a new tab)
5 DeepInfravia Hugging Face 0.10  0.30  0.15  – 262k United States
See pricing at Hugging Face (opens in a new tab)
6 SiliconFlowvia Kilo Gateway 0.10  0.30  0.15  fp8 262k Unverified. The source page shows one price per model, not this seller's: listed, not designated cheapest
Go to offer at Kilo Gateway (opens in a new tab)
7 Glama 0.10  0.30  0.15  – 262k Unverified. No public page for this offer: listed, not designated cheapest
: Glama (opens in a new tab). No public price page for this model
8 Martian 0.10  0.30  0.15  – – worldwide Unverified. Neither seller nor price found on its page for 72 hours: listed, not designated cheapest
See pricing at Martian (opens in a new tab)
9 Nous Portal 0.10  0.30  0.15  – 262k Unverified. Neither seller nor price found on its page for 72 hours: listed, not designated cheapest
See pricing at Nous Portal (opens in a new tab)
10 ZenMux 0.10  0.30  0.15  – 256k
Go to offer at ZenMux (opens in a new tab)
11 SiliconFlowvia OpenRouter 0.10  0.30  0.15  fp8 262k Fee 5.5%: OpenRouter adds a 5.5% fee when you buy credits (read on openrouter.ai/pricing on Oct 31). Offers are ranked with this fee included.
Go to offer at OpenRouter (opens in a new tab)
12 ShengSuanYun 0.105 0.316 0.158 – 256k Unverified. No public page for this offer: listed, not designated cheapest
: ShengSuanYun (opens in a new tab). No public price page for this model

No training on promptsPrompts may be used for trainingTraining terms not published

backend not named. The router bills this price itself without naming who serves the model.

Blended = (3 × input + output) / 4, per million tokens. Prices in USD, converted at the ECB rate when the provider bills in another currency.

Method

Monthly cost for your workload

Computed by the API for the three cheapest offers, per 30-day month.
  1. Featherless$10.50per month
  2. EmpirioLabs AI$10.50per month+$0.00 vs the cheapest
  3. NanoGPT$10.50per month+$0.00 vs the cheapest

Host it yourself instead? See the break-even

Compare Step 3.5 Flash with

Related models

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All StepFun models

Same index family

Use this data

The index is queryable. The API is free to use.
Free API
curl https://api.inferindex.dev/cheapest?model=stepfun/step-3.5-flash
MCP server
claude mcp add --transport http inferindex https://mcp.inferindex.dev/mcp

Also works in Cursor and Codex: see the MCP page.