Step 3.5 Flash

open weightsdeprecated by benchmark source

StepFun · released 2026-02-02 · 1 offer

Context 256K tokens

Top 1 cheapest providers (Adjusted $/task)

Within the active global provider, residency and confidentiality filters.

#	Provider	Price channel	Raw input $/1M	Raw output $/1M	Adjusted $/task
1	SiliconFlowvia OpenRouter — Price via OpenRouter: OpenRouter's price for SiliconFlow's endpoint (https://openrouter.ai/stepfun/step-3.5-flash/providers), collected 2026-11-03.	via OpenRouter — Price via OpenRouter: OpenRouter's price for SiliconFlow's endpoint (https://openrouter.ai/stepfun/step-3.5-flash/providers), collected 2026-11-03.	$0.100	$0.300

Composite

1 of 7 inputs6 radar axes: DesignArena's two boards share one

19.0

Thin data · 1/7

dominance-adjusted from 20.1: a better-measured model that is at least as good on each of these inputs ranks above it

AA Coding v4.x —Coding Agent v1.4 —AA Intelligence (est.) 6.3AA Agentic —Epoch ECI —Software ECI —DesignArena —/—

Radar: percentile among all models measured on each input; a gap means not measured.

Benchmark sheet

12 of 319 registered benchmark versions · bars show the percentile among all models measured on each benchmark.

Compare this model →

Agentic

Terminal-Bench Hard (AA)6927.3%2026-09-10
Terminal-Bench Hard (AA) pinned revision 74221fb → · Published board — Tests a pinned 44-task hard subset of terminal-based work using Terminus 2.

Instruction-following

IFBench (AA single-turn)7664.6%2026-09-10
IFBench (AA single-turn) published 2026-09-10 → · Published board — Tests precise single-turn instructions with deterministic rule checks.

Knowledge

Humanity's Last Exam (AA text-only)7221.1%2026-09-10
Humanity's Last Exam (AA text-only) published 2026-09-10 → · Published board — Tests expert-level knowledge on AA's text-only Humanity's Last Exam subset.
AA-Omniscience Index44-41.82026-09-10
AA-Omniscience Index published 2026-09-10 → · Published board — Tests factual reliability while rewarding correct answers and penalizing hallucinations.
UGI NatInt6837.62026-09-10
UGI NatInt published 2026-09-10 → · Published board — A private-question evaluation of general knowledge and reasoning across textbook, popular-culture and world-model topics.

Long-context

AA-LCR v1.14650.0%2026-09-10
AA-LCR v1.1 v1.1 → · Published board — Tests reasoning across multiple long documents with corrected answer keys and grading.

Science

CritPt (AA)702.5%2026-09-10
CritPt (AA) published 2026-09-10 → · Published board — Tests research-level physics reasoning with Python, symbolic and numerical answers.
GPQA Diamond (AA)7383.1%2026-09-10
GPQA Diamond (AA) published 2026-09-10 → · Published board — Tests graduate-level biology, physics and chemistry knowledge on the Diamond subset.

Tool-use

τ²-Bench Telecom (AA)9394.4%2026-09-10
τ²-Bench Telecom (AA) published 2026-09-10 → · Published board — Tests dual-control telecom agents that coordinate tool use with a simulated user.

Uncensored

UGI Willingness342.502026-09-10
UGI Willingness published 2026-09-10 → · Published board — A private-question evaluation of how far a model follows challenging instructions before refusing or deviating.
UGI6240.82026-09-10
UGI published 2026-09-10 → · Published board — A private-question suite combining sensitive-topic knowledge with willingness to follow controversial instructions.

Writing

UGI Writing7345.92026-09-10
UGI Writing published 2026-09-10 → · Published board — A maintainer-owned writing evaluation considering intelligence, style, repetition and length adherence, informed by human preferences.

Missing coverage · 307 benchmark versions

No result does not mean a zero, or that the model was never tested. Collection failures and disputed versions retain their distinct status.

Token offers by platform · 1 offer (Adjusted $/task)

Click any underlined price to see how it is estimated and where each input comes from. How we calculate adjusted cost.

1 offer within the active global filters; “price n/a” means the provider serves the model but publishes no direct token price we could collect — no other channel's price is shown in its place.

OpenRouter (1)

Prices via OpenRouter — what OpenRouter charges for each provider's endpoint, not the provider's own direct price. Source: openrouter.ai/stepfun/step-3.5-flash/providers, collected 2026-11-03.

SiliconFlow