prices synced 2026-07-28
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Step 3.5 Flash

StepFun · Released Jan 2026

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StepFun's sparse Mixture of Experts model that activates 11B of 196B parameters per token, providing a balance between capability and efficiency.

Strengths
Its MoE architecture enables high capability while maintaining low inference costs through selective parameter activation.
Best for
Workloads requiring strong reasoning and language understanding where latency and throughput efficiency matter.
Limitations
As a sparse MoE model, it may show less consistent performance on tasks that don't align well with its expert specializations compared to dense models.

Input / 1M

$0.1

Output / 1M

$0.3

Cached input / 1M

Context window

262K

Price history

Input (solid)Output (dashed)
Price per 1M tokens over timeOutput went from $0.3 to $0.3; Input went from $0.09 to $0.1 between Jun 2026 and Jun 2026.$0$0.1$0.2$0.3Output on 11 Jun 2026: $0.3Output on 30 Jun 2026: $0.3Out $0.3Input on 11 Jun 2026: $0.09Input on 30 Jun 2026: $0.1In $0.1Jun 2026Jun 2026

Price change

30d
in increased 11.1% out decreased 0.0%
90d
in increased 11.1% out decreased 0.0%
1y
in increased 11.1% out decreased 0.0%
Since launch
in increased 11.1% out decreased 0.0%

Snapshots

Effective Input Output Cached in Note Source
30 Jun 2026 $0.1 $0.3 Imported from OpenRouter openrouter.ai
11 Jun 2026 $0.09 $0.3 $0.02 Imported from OpenRouter openrouter.ai

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