Step 3.5 Flash — Currently unavailable

Currently unavailableBazaarLink no longer offers this model. This page remains available as a historical reference.

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....

Provider	stepfun
Released	January 2026
Model ID	`stepfun/step-3.5-flash`

Technical specifications

Context window

262K tokens

Reasoning

—

Input

Text

Output

Text

Independent benchmarks

Scores below come from Artificial Analysis, an independent third party. BazaarLink does not participate in the testing.

Intelligence 17

Coding

Math

MMLU

GPQA 83

This modelCategory leader

Overall intelligence

#217out of 638 models

Aggregated across academic benchmarks

Time to first token

#215out of 329 models

AA 全球 p50：3.33 秒

Intelligence

Mid-tier

This model

Category leader

Median

GPQA

83%

—

This model

83%

Category leader

94%

Median

69%

HLE

23%

—

This model

23%

Category leader

53%

Median

SciCode

39%

—

This model

39%

Category leader

60%

Median

34%

IFBench

67%

—

This model

67%

Category leader

83%

Median

44%

τ²-Bench Telecom

87%

—

This model

87%

Category leader

99%

Median

46%

AA-LCR

54%

—

This model

54%

Category leader

76%

Median

40%

Terminal-Bench Hard

33%

—

This model

33%

Category leader

66%

Median

14%

Top 5 — CodingCoding Index leaderboard

1Claude Fable 5.1 (Adaptive Reasoning, Max Effort, Default Fallback)?/claude-fable-5-182$10 / $50

2Claude Fable 5.1 (Adaptive Reasoning, Xhigh Effort, Default Fallback)?/claude-fable-5-1-xhigh81$10 / $50

3Claude Fable 5.1 (Adaptive Reasoning, High Effort, Default Fallback)?/claude-fable-5-1-high79$10 / $50

4GPT-5.6 Sol (xhigh)openai/gpt-5-6-sol-xhigh78$4 / $20

5Claude Opus 5 (Adaptive Reasoning, Max Effort)anthropic/claude-opus-578$5 / $25

AASource: Artificial Analysis · Independent third-party evaluation; not influenced by BazaarLinkView full evaluation on AA →

← All Models

Frequently Asked Questions

Can I still use Step 3.5 Flash through BazaarLink?

No. Step 3.5 Flash is currently unavailable through BazaarLink. See the active alternatives linked on this page.

Relay integrity checks

Tested endpoints: 1 runs
Independent hosts: 1
Model-family fingerprint match: 0%
Anomalies detected: 1 runs
Data range: past 90 days

BazaarLink Probe verifies endpoints that claim to serve this model and flags behavior that differs from the reference baseline.

View the full integrity report →

Step 3.5 Flash — Currently unavailable

Technical specifications

Independent benchmarks

Top 5 — CodingCoding Index leaderboard

Frequently Asked Questions

Relay integrity checks

Related models and links