StepFun API listing

Step-3.5-Flash API pricing on StepFun

StepFun's published API listing for Step-3.5-Flash, with native prices and dated evidence. Check the official source for current availability and account eligibility.

Headline USD token rates per 1M; other currencies and units remain native. Original rates are below. Unknown means no unambiguous headline; inspect all rates and conditions below.
API listingInputCache readOutputCapability (Epoch AI)
Step-3.5-FlashUSD 0.10 / 1M tokensTier unspecifiedUSD 0.02 / 1M tokensTier unspecifiedUSD 0.30 / 1M tokensTier unspecifiedNo independent capability score

Rates, billing conditions and sources

Step-3.5-Flash

Service ID: step-3.5-flash · Context window: 256K tokens · Listing status: active

All rates, conditions and sources

Input: USD 0.10 / 1M tokens · Modality: unspecified

Region: international · Endpoint scope: international · Tier: Unknown · Billing: Unknown · Prompt bracket: none stated · Cache TTL: Unknown seconds · Valid through: Unknown

  • StepFun international platform (platform.stepfun.ai) direct API, USD per 1M tokens; China-platform pricing is out of scope.
  • Model ID step-3.5-flash.
  • Input price on cache miss.

Cache read: USD 0.02 / 1M tokens · Modality: unspecified

Region: international · Endpoint scope: international · Tier: Unknown · Billing: Unknown · Prompt bracket: none stated · Cache TTL: Unknown seconds · Valid through: Unknown

  • StepFun international platform (platform.stepfun.ai) direct API, USD per 1M tokens; China-platform pricing is out of scope.
  • Model ID step-3.5-flash.
  • Input that hits the prompt cache.

Output: USD 0.30 / 1M tokens · Modality: unspecified

Region: international · Endpoint scope: international · Tier: Unknown · Billing: Unknown · Prompt bracket: none stated · Cache TTL: Unknown seconds · Valid through: Unknown

  • StepFun international platform (platform.stepfun.ai) direct API, USD per 1M tokens; China-platform pricing is out of scope.
  • Model ID step-3.5-flash.

Developer: Unknown / not verified · API seller: StepFun

Checkpoint: Unknown / not verified · Lineage: Unknown / not verified

Official pricing ↗

Price observed: 2026-11-03T04:27:23.192Z · Price source checked: 2026-11-03T04:27:23.192Z · Price freshness: fresh

Weight-license reviewed: Unknown. Open weights do not establish permission for every commercial use; consult the linked terms.

Gating: unknown · Code license: Unknown / not verified · API availability: available (dated observation, not a live service check)

Source, conditions and dates

Primary source ↗ · vendor-docs · Claims: stepfun-api-step-5-preview: pricing · stepfun-api-step-5-preview: availability · stepfun-api-step-3-7-flash: pricing · stepfun-api-step-3-7-flash: availability · stepfun-api-step-3-5-flash: pricing · stepfun-api-step-3-5-flash: availability · Retrieved · Effective: Unknown · Checked: 2026-09-27T11:56:18.231Z · Reviewed: Unknown · Review after: Unknown · Freshness: unknown · Confidence: A

  • Raw SHA-256: e53bfd9dc98d997e58aeda7d9030de843588063fda5bbe4569f39c9844c3449a; collector stepfun-international-1.
  • Pricing and listing observation only; no checkpoint, license, context-window or release-date assertions. The API models are not linked to downloadable checkpoints.

Primary source ↗ · vendor-docs · Claims: stepfun-api-step-5-preview: pricing · stepfun-api-step-3-7-flash: pricing · stepfun-api-step-3-5-flash: pricing · Retrieved · Effective: Unknown · Checked: 2026-09-30T04:38:59.731Z · Reviewed: Unknown · Review after: Unknown · Freshness: unknown · Confidence: A

  • Raw SHA-256: 734d06ca34b5a4d8ec1e673c08126b1b344bfb094ac37410b9216c2a874f9711; collector stepfun-international-1.
  • Pricing and listing observation only; no checkpoint, license, context-window or release-date assertions. The API models are not linked to downloadable checkpoints.

Primary source ↗ · vendor-docs · Claims: stepfun-api-step-5-preview: pricing · stepfun-api-step-3-7-flash: pricing · stepfun-api-step-3-5-flash: pricing · Retrieved · Effective: Unknown · Checked: 2026-10-07T04:39:40.176Z · Reviewed: Unknown · Review after: Unknown · Freshness: unknown · Confidence: A

  • Raw SHA-256: 1bb24b326b8c3bd3c7118c61067bce83fa36f056983e4b296338e9f75b8b19b0; collector stepfun-international-1.
  • Pricing and listing observation only; no checkpoint, license, context-window or release-date assertions. The API models are not linked to downloadable checkpoints.

Primary source ↗ · vendor-docs · Claims: stepfun-api-step-5-preview: pricing · stepfun-api-step-3-7-flash: pricing · stepfun-api-step-3-5-flash: pricing · Retrieved · Effective: Unknown · Checked: 2026-10-09T04:40:58.110Z · Reviewed: Unknown · Review after: Unknown · Freshness: unknown · Confidence: A

  • Raw SHA-256: 4a7df9e638dddfc620ffa2fc872003b1177530845bd255480d2bba3e58dfdaf4; collector stepfun-international-1.
  • Pricing and listing observation only; no checkpoint, license, context-window or release-date assertions. The API models are not linked to downloadable checkpoints.

Primary source ↗ · vendor-docs · Claims: stepfun-api-step-5-preview: pricing · stepfun-api-step-3-7-flash: pricing · stepfun-api-step-3-5-flash: pricing · Retrieved · Effective: Unknown · Checked: 2026-10-10T04:38:10.330Z · Reviewed: Unknown · Review after: Unknown · Freshness: unknown · Confidence: A

  • Raw SHA-256: 7998c3ae295b1e7fcd24f2fd1d04c94b18f72d796176d27f49d6485768fa0673; collector stepfun-international-1.
  • Pricing and listing observation only; no checkpoint, license, context-window or release-date assertions. The API models are not linked to downloadable checkpoints.

Primary source ↗ · vendor-docs · Claims: stepfun-api-step-5-preview: pricing · stepfun-api-step-3-7-flash: pricing · stepfun-api-step-3-5-flash: pricing · Retrieved · Effective: Unknown · Checked: 2026-10-12T04:49:44.754Z · Reviewed: Unknown · Review after: 2026-10-22T04:49:44.754Z · Freshness: stale · Confidence: A

  • Raw SHA-256: dcaeb0c5389fb8218a5b57eafa22b3da572f52bff80ae7a7bc35acb1cb04da01; collector stepfun-international-1.
  • Pricing and listing observation only; no checkpoint, license, context-window or release-date assertions. The API models are not linked to downloadable checkpoints.

Primary source ↗ · vendor-docs · Claims: stepfun-api-step-3-5-flash: specifications · Retrieved · Effective: Unknown · Checked: 2026-10-14T01:47:12Z · Reviewed: 2026-10-17T22:41:12Z · Review after: Unknown · Freshness: unknown · Confidence: A

  • Official StepFun model page for step-3.5-flash, raw SHA-256 65dcbc8ea619b338c78d7dcba28cf37f39fb6dd507da92740edee6d91ed30d74: "Context length 256K tokens".
  • Visible shorthand recorded as stated (#504); not converted to an exact token count.
  • Specifications only: no pricing, availability, capability or release-date assertion.

Primary source ↗ · vendor-docs · Claims: stepfun-api-step-5-preview: pricing · stepfun-api-step-5-preview: availability · stepfun-api-step-3-7-flash: pricing · stepfun-api-step-3-7-flash: availability · stepfun-api-step-3-5-flash: pricing · stepfun-api-step-3-5-flash: availability · Retrieved · Effective: Unknown · Checked: 2026-10-18T04:35:04.276Z · Reviewed: Unknown · Review after: 2026-10-28T04:35:04.276Z · Freshness: stale · Confidence: A

  • Raw SHA-256: dcaeb0c5389fb8218a5b57eafa22b3da572f52bff80ae7a7bc35acb1cb04da01; collector stepfun-international-1.
  • Pricing and listing observation only; no checkpoint, license, context-window or release-date assertions. The API models are not linked to downloadable checkpoints.

Primary source ↗ · vendor-docs · Claims: stepfun-api-step-5-preview: pricing · stepfun-api-step-5-preview: availability · stepfun-api-step-3-7-flash: pricing · stepfun-api-step-3-7-flash: availability · stepfun-api-step-3-5-flash: pricing · stepfun-api-step-3-5-flash: availability · Retrieved · Effective: Unknown · Checked: 2026-11-02T04:28:28.433Z · Reviewed: Unknown · Review after: 2026-11-12T04:28:28.433Z · Freshness: stale · Confidence: A

  • Raw SHA-256: d09376206e90e63192fca3540bae3690e6d47dbbe70fc0fc480700cde3206877; collector stepfun-international-1.
  • Pricing and listing observation only; no checkpoint, license, context-window or release-date assertions. The API models are not linked to downloadable checkpoints.

Primary source ↗ · vendor-docs · Claims: stepfun-api-step-5-preview: pricing · stepfun-api-step-5-preview: availability · stepfun-api-step-3-7-flash: pricing · stepfun-api-step-3-7-flash: availability · stepfun-api-step-3-5-flash: pricing · stepfun-api-step-3-5-flash: availability · Retrieved · Effective: Unknown · Checked: 2026-11-03T04:27:23.192Z · Reviewed: Unknown · Review after: 2026-11-13T04:27:23.192Z · Freshness: fresh · Confidence: A

  • Raw SHA-256: 6daaf65ec793230b80184ed145862ed6b20ff333b915296d14bfa1689efd45d8; collector stepfun-international-1.
  • Pricing and listing observation only; no checkpoint, license, context-window or release-date assertions. The API models are not linked to downloadable checkpoints.
About capability scores (Epoch AI)

Capability scores: Epoch AI, 'Capabilities & benchmarking'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/benchmarks' [online resource], epoch.ai/benchmarks. Accessed 2026-10-31. Licensed CC BY 4.0; values here are rounded to one decimal place and grouped into bands.

The Epoch Capabilities Index (ECI) combines many benchmarks on a scale where Claude 3.5 Sonnet is 130 and GPT-5 is 150. Bands, on the displayed one-decimal score: Frontier 160+, Strong 150–159.9, Capable 140–149.9, Entry below 140. Each score has a 90% range; a range that crosses a band boundary is flagged. Models are not ranked: neighbouring scores often overlap.

A benchmark is not your workload. Epoch's scores mostly reflect runs at the highest reasoning effort, which use more output tokens than default settings. Scores are dated and can shift between Epoch releases. A score belongs to the developer's model; a host listing shows the same model's score, but hosts may serve different versions or quantizations.

How headline rates are chosen

Headline rates use the directory's shared rule: the rate a buyer meets by default, chosen by billing, tier and context dimensions and never by price. Context caps, the bracket starting at zero and short-context variants are labeled; unverified availability is flagged and is not a service guarantee. Batch, off-peak and other variants remain in the details; ambiguous headlines stay unknown.

No currency conversion is performed. Missing cache prices are unknown, not zero. Equal units do not establish equivalent models or service conditions. See the methodology and source register.