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stepfunmodel
StepFun: Step 3.5 Flash
Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token....
Best for
Bulk Data ExtractionHigh-Volume TasksLong DocumentsBook Summarisation
Context Window
262K tokens ≈ 583 pages of text
Input Cost
$0.10/1M
Output Cost
$0.30/1M
Latency p50
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Pricing Details
Standard Pricing
Input (per 1M tokens)
$0.10
Output (per 1M tokens)
$0.30
Price history
4/18/2026$0.10 in / $0.30 out
4/17/2026$0.10 in / $0.30 out
4/16/2026$0.10 in / $0.30 out
4/16/2026$0.10 in / $0.30 out
4/16/2026$0.10 in / $0.30 out
Hallucination Score™ (est.)
Community reliability estimate · not official
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Not yet rated
About this score: Community-estimated based on user reports and publicly available benchmark data (e.g. TruthfulQA). This is not an official score from the model provider. Scores may be inaccurate — always verify with the official leaderboard before making production decisions.
Price HistoryPro
Input & output cost per 1M tokens over time
Price history is a Pro feature
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stepfun
Community Prompts
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