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ModelCap

Step 3.5 Flash FP8

Official build · attached, unrankedOpen weights

Stepfun Ai·stepfun-ai/Step-3.5-Flash-FP8

Step 3.5 Flash FP8 weight access is open weights, from ModelCap classification of published repository metadata as of 9 Sept 2026, 22:51 UTC.

Snapshot facts · download the public dataset · methodology

ModelCap Index
See primary model · Step 3.5 Flash
This release is visible for discovery, not ranked as a peer model
Market Gravity
12.1
Secondary market signal

Superseded by Step 3.7 Flash FP8. It no longer holds a current-board position.

This separately configured or accelerated route is reviewed as the same underlying model identity as Step 3.5 Flash. That canonical product owns rank and capability evidence; pricing, providers and other operational differences remain route-specific below.

OpenRouter endpoint status could not be refreshed. This model is not treated as currently served until a successful observation arrives.

Input
Self-hosted
weights only · no listed API price
Output
Self-hosted
weights only · no listed API price
Context
—
tokens
Providers
0
endpoints
Gateway spend
—
latest · Vercel share

Providers

Uptime measured over the last 30 minutes

Current provider status is unavailable.

Other versions (1)

Deployment readiness

Metadata index
52.4
partial · 56% metadata coverage
Not capability
Artifact reproducibility
100.0
Access & legal clarity
100.0
Deployability
8.0
Evaluation provenance
0.0

Missing: deployability.independent-provider-records, deployability.measured-provider-uptime, deployability.published-provider-pricing, deployability.declared-capacity, evaluationProvenance.admitted-evaluation-observations, evaluationProvenance.capability-family-breadth, evaluationProvenance.evaluation-source-diversity, evaluationProvenance.identity-and-source-confidence, evaluationProvenance.evaluation-dataset-revisions.

A metadata completeness and deployability index—not a safety certification, quality grade, or production-readiness claim.

Market activity

Venue coverage
Market Gravity
12.1
OpenRouter weekly popularity
Not listed

Market Gravity uses OpenRouter’s full-catalogue popularity order. Sparse Vercel top-ten observations appear only when published and do not affect the score.

Market Gravity breakdown

Usage55%
0.0

OpenRouter weekly popularity across the full model catalogue.

Liquidity25%
0.0

Independent providers versus the model's open or closed cohort, weighted by uptime.

Open reach15%
66.5

Hugging Face 30-day downloads for open models; neutral for closed models.

Freshness5%
43.2

Time since first public availability, on a six-month half-life.

Specification

Context window
— tokens
Max output
—
Inputs
Text
Outputs
Text
Tokenizer
—
Cached input tokens
Not offered
First seen on OpenRouter
1 Feb 2026

Capabilities

  • Not supported: Reasoning
  • Not supported: Tool use
  • Not supported: Structured output
  • Not supported: Response format
  • Not supported: Moderated

Weights & access

Open weights. Downloadable weights are published under an OSI or free-culture license in the current repository metadata. This describes weight availability, not whether the full training stack qualifies as Open Source AI.

Access
Open weights
Licence
apache-2.0
Pinned revision
6eebda59dd87
Parameters
199.4B
Architecture
Step3p5ForCausalLM
Model type
step3p5
Hugging Face downloads (30d)
4K
Downloads (all time)
651K
Likes
53
Repository
stepfun-ai/Step-3.5-Flash-FP8
Repository updated
9 Mar 2026, 03:49 UTC
Base lineage
stepfun-ai/step-3.5-flash