Step 3.5 Flash
Not tested yet
Language modelOpen source
Step 3.5 Flash
StepFun
- Released
- February 2026
- Data date
- September 8, 2026
- Intelligence
- Overall score
- Speed
- 218.4 tokens/sOutput throughput
- Price
- Input · Output / 1M tokens
- Input
- Text
- Output
- Text
No published category-wide ranking is available for this model.
Entries 1-12 of 22. Page 1 of 2.
Measurements without matching peer values
These measurements have no matching peer values under the same test conditions. Their original values and sources remain available here.
tau2-Bench (Show measurement, test conditions, and source)
- Source value
- 88.2
- Score
- 88.2
- Metric
- percent
- Unit
- %
- Category
- mixed
- Direction
- Higher is better
- Comparison cohort
- research:step-3.5-flash:0
- Source type
- vendor-reported
- Evaluator
- StepFun Step 3.5 Flash repository/model README
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. Official detailed table; benchmark-specific harness, context-manager and reproduced-score caveats are stated in the README.
BrowseComp (Show measurement, test conditions, and source)
- Source value
- 51.6
- Score
- 51.6
- Metric
- percent
- Unit
- %
- Category
- mixed
- Direction
- Higher is better
- Comparison cohort
- research:step-3.5-flash:1
- Source type
- vendor-reported
- Evaluator
- StepFun Step 3.5 Flash repository/model README
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. Official detailed table; benchmark-specific harness, context-manager and reproduced-score caveats are stated in the README.
BrowseComp (with Context Manager) (Show measurement, test conditions, and source)
- Source value
- 69
- Score
- 69
- Metric
- percent
- Unit
- %
- Category
- mixed
- Direction
- Higher is better
- Comparison cohort
- research:step-3.5-flash:2
- Source type
- vendor-reported
- Evaluator
- StepFun Step 3.5 Flash repository/model README
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. Official detailed table; benchmark-specific harness, context-manager and reproduced-score caveats are stated in the README.
BrowseComp-ZH (Show measurement, test conditions, and source)
- Source value
- 66.9
- Score
- 66.9
- Metric
- percent
- Unit
- %
- Category
- mixed
- Direction
- Higher is better
- Comparison cohort
- research:step-3.5-flash:3
- Source type
- vendor-reported
- Evaluator
- StepFun Step 3.5 Flash repository/model README
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. Official detailed table; benchmark-specific harness, context-manager and reproduced-score caveats are stated in the README.
BrowseComp-ZH (with Context Manager) (Show measurement, test conditions, and source)
- Source value
- 73.7
- Score
- 73.7
- Metric
- percent
- Unit
- %
- Category
- mixed
- Direction
- Higher is better
- Comparison cohort
- research:step-3.5-flash:4
- Source type
- vendor-reported
- Evaluator
- StepFun Step 3.5 Flash repository/model README
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. Official detailed table; benchmark-specific harness, context-manager and reproduced-score caveats are stated in the README.
GAIA (no file) (Show measurement, test conditions, and source)
- Source value
- 84.5
- Score
- 84.5
- Metric
- percent
- Unit
- %
- Category
- mixed
- Direction
- Higher is better
- Comparison cohort
- research:step-3.5-flash:5
- Source type
- vendor-reported
- Evaluator
- StepFun Step 3.5 Flash repository/model README
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. Official detailed table; benchmark-specific harness, context-manager and reproduced-score caveats are stated in the README.
xbench-DeepSearch (2025.05) (Show measurement, test conditions, and source)
- Source value
- 83.7
- Score
- 83.7
- Metric
- percent
- Unit
- %
- Category
- mixed
- Direction
- Higher is better
- Comparison cohort
- research:step-3.5-flash:6
- Source type
- vendor-reported
- Evaluator
- StepFun Step 3.5 Flash repository/model README
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. Official detailed table; benchmark-specific harness, context-manager and reproduced-score caveats are stated in the README.
xbench-DeepSearch (2025.10) (Show measurement, test conditions, and source)
- Source value
- 56.3
- Score
- 56.3
- Metric
- percent
- Unit
- %
- Category
- mixed
- Direction
- Higher is better
- Comparison cohort
- research:step-3.5-flash:7
- Source type
- vendor-reported
- Evaluator
- StepFun Step 3.5 Flash repository/model README
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. Official detailed table; benchmark-specific harness, context-manager and reproduced-score caveats are stated in the README.
ResearchRubrics (Show measurement, test conditions, and source)
- Source value
- 65.3
- Score
- 65.3
- Metric
- percent
- Unit
- %
- Category
- mixed
- Direction
- Higher is better
- Comparison cohort
- research:step-3.5-flash:8
- Source type
- vendor-reported
- Evaluator
- StepFun Step 3.5 Flash repository/model README
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. Official detailed table; benchmark-specific harness, context-manager and reproduced-score caveats are stated in the README.
AIME 2025 (Show measurement, test conditions, and source)
- Source value
- 97.3
- Score
- 97.3
- Metric
- percent
- Unit
- %
- Category
- mixed
- Direction
- Higher is better
- Comparison cohort
- research:step-3.5-flash:9
- Source type
- vendor-reported
- Evaluator
- StepFun Step 3.5 Flash repository/model README
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. Official detailed table; benchmark-specific harness, context-manager and reproduced-score caveats are stated in the README.
HMMT 2025 (Feb.) (Show measurement, test conditions, and source)
- Source value
- 98.4
- Score
- 98.4
- Metric
- percent
- Unit
- %
- Category
- mixed
- Direction
- Higher is better
- Comparison cohort
- research:step-3.5-flash:10
- Source type
- vendor-reported
- Evaluator
- StepFun Step 3.5 Flash repository/model README
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. Official detailed table; benchmark-specific harness, context-manager and reproduced-score caveats are stated in the README.
HMMT 2025 (Nov.) (Show measurement, test conditions, and source)
- Source value
- 94
- Score
- 94
- Metric
- percent
- Unit
- %
- Category
- mixed
- Direction
- Higher is better
- Comparison cohort
- research:step-3.5-flash:11
- Source type
- vendor-reported
- Evaluator
- StepFun Step 3.5 Flash repository/model README
- Status
- active
- Retrieved at
- 2026-09-08
- Methodology
- Vendor-reported result. Official detailed table; benchmark-specific harness, context-manager and reproduced-score caveats are stated in the README.
Our model tests
Community tests you can inspect
Compare how the models respond to the same prompt. Each test shows the first attempt, with no subsequent fixes to the generated code. These results do not contribute to an overall score.
Pelican on a bicycle
A community classic for free-form SVG drawing.
Prompt and test conditions
Generate an SVG of a pelican riding a bicycle
Token limit including reasoning: 8,192 tokens
Task origin (Simon Willison)Profile
Specifications and access
Published information about this model. Existing estimates are explicitly labeled.
Additional source observations
Dated documentation and model-card observations. Provider limits, native context and extended context can differ. Configuration notes retain the source wording.
- License
- Apache-2.0Source
- Parameters
- 196.81 BSource
- Active parameters
- 11 BSource
- Architecture
- 45-layer sparse MoE Transformer, hidden size 4096, 288 routed experts plus one shared expert, top-8 routing, 3-way MTPSource
- Input
- TextSource
- Output
- TextSource
- Reasoning mode
- reasoning and agent scenarios recommend temperature 1.0, top_p 0.95; parallel thinking is documentedSource
- Tool calling
- YesSource
- API model ID
- step-3.5-flashSource
- Throughput in tokens per second
- 100-300 typical, up to 350 single-stream coding (Throughput is a usage claim, not a benchmark score.)Source
Pricing
Published prices
Prices apply to the stated unit. Resolution, output length, and provider can change the cost.
Cost example
100 API requests
$0.025
100 requests with 1,000 input and 500 output tokens each calculate to $0.025. Input accounts for $0.01; output accounts for $0.015.
- Input price
- $0.1 / 1M tokensBase tier for each request
- Output price
- $0.3 / 1M tokensBase tier for each request
The calculation uses documented token prices and no cache discount. It excludes extra tools, tax, reasoning tokens, and further hidden output tokens.
Open sourceHead-to-head comparisons
Compare this model
Each matchup compares this model with exactly one other model from the same category.
There are no published direct comparisons for this model yet.
More models
Models from the same selection
All AI models
Evidence
Sources and data date
Every statement links to its underlying documentation or leaderboard.
- Speed
StepFun. Output speed after the first streaming chunk, not total response time. Classified as deprecated by Artificial Analysis. Artificial Analysis maintains only the default 10K-input workload there. Retrieved September 8, 2026.
- Price
Base API prices without caching or batch discounts. Higher context tiers and other rates are listed under Costs.
- Input
Documented modalities. Retrieved September 8, 2026.
- Output
Documented modalities. Retrieved September 8, 2026.
Research date September 8, 2026. 3 source URLs checked. This documents the inspected sources, not an exhaustive inventory of every publication.
Open evidence questions and research notes (original wording)
Not found in the inspected sources
release-date. The checked repository and release page do not expose a precise dated launch field.
Not found in the inspected sources
knowledge-cutoff. The exact Step 3.5 Flash README does not publish a knowledge cutoff.