Step 3.5 Flash step-3.5-flash
stepfun-ai · stepfun-ai
unranked — no quality signals yet
- params
- 199.4B
- arch
- moe
- context
- 256k
- license
- apache-2.0 open weights
- released
- Feb 2026
- downloads/30d
- 231.5k
# architecture
- layers
- 45
- d_model
- 4096
- heads
- 64q / 64kv
- head dim
- 128
- experts
- top-8 of 288
- vocab
- 128896
- family
- step3p5
signal path of one layer, generated from the registry's structured fields — dimension lines quote the model's real numbers; an MoE trace forks at the router, a dense trace runs straight through. Geometry fields come from the repo's config.json.
# why ranked
Overall: provisional — score 42.3 ● low — a single signal; treat with caution
provisional: too few independent signals for a numbered position — the score is shown, but this model sorts after every ranked model.
| signal | weight | input (0–100) |
|---|---|---|
| aa_intelligence | 0.70 | — |
| bench_composite | 0.30 | 42.3 |
benchmark panel evidence:
| complete panel | score (0–100) |
|---|---|
| aime-2025-v1 | 45.1 |
| browsecomp-v1 | 39.4 |
missing signals are dropped and the remaining weights renormalized — never imputed.
# trend
# benchmarks
# where to run
| provider | quant | ctx | $/M in | $/M out | $/M cache | price src | tps | uptime | ✓ |
|---|---|---|---|---|---|---|---|---|---|
| Featherless | — | — | — | — | via hfrouter | — | — | ||
| DeepInfra | 256k | $0.10 | $0.30 | — | via hfrouter | 32 | — | ||
| SiliconFlow | fp8 | 256k | $0.10 | $0.30 | — | openrouter | — | 98.8% | ✓ |
sorted by blended price ((3·input + output) / 4 per 1M) · ✓ = the provider's own catalog confirms the offer · "via …" prices are what the aggregator routing the offer charges, not the provider's own list price
source aliases
- llmstats
step-3.5-flash- openrouter
stepfun/step-3.5-flash