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Step 3.5 Flash 2603

Try Step 3.5 Flash 2603 on us. Starter credit covers your first requests, then one key reaches this route and every other model in the catalog.

`stepfun/step-3.5-flash-2603`

StepFun

All models

Publisher	StepFunstepfun
AI IQ	No AI IQ profile matched yet.
Context	262,144 tokens
Providers	StepFun
Credits routes	1 provider route
Modes	chat
Billing	Credits

Current route evidence

Live leaderboard

$0.1055/1MLowest Credits input price

$0.3165/1MLowest Credits output price

2709 msFastest measured p50 TTFT via stepfun

not enough dataHighest measured throughput

Recent provider-route uptime spans 100.00% across 1 route and 1 provider. Price comes from the current Credits catalog. Speed and uptime come from routed probes rather than vendor claims.

Providers serving this model

Sorted by lowest combined prompt and completion price. Use "provider": {"sort": "throughput"} in the request body (or append :nitro to the model id) to route to the fastest provider instead.

Trust boundary: TR router attestation verifies the TrustedRouter gateway only. Provider policy separately describes the upstream model host's retention, confidential compute, and E2EE posture. Company country is separate from inference location. Weight formats are source-backed declarations, not per-request proofs.

Provider	Input	Cached input	Output	Weight format	Provider policy	Company / inference location	Measured speed
StepFunstepfun	$0.1055/1M	$0.0211/1M	$0.3165/1M	Unknown	no verified privacy claim Retention details StepFun's public privacy policy does not provide contractual zero retention or confidential-compute guarantees for API requests. TrustedRouter therefore classifies this route as Standard. Provider policy source	Operator country: CN Location details Headquarters / registered office: Not verified. Inference: Inference location not verified; no country-specific residency commitment. No inference-location declaration has been verified for this provider. Region pinning through TR: No verified provider-specific location pin documented here. Full location evidence	TTFT: 2.71 s Speed: insufficient data Last sample: 2026-10-31T06:36:36.000Z

Speed is the median (p50) from TR's recent measured requests for this exact model and provider, refreshed from the cached leaderboard. At least two timing samples are required; workload and network conditions affect results. Performance details

Compare Step 3.5 Flash 2603

All comparisons

Step 3.5 Flash 2603 vs Z.ai: GLM 5.334 combined provider routes

Questions

What model ID should I use for Step 3.5 Flash 2603?

Use stepfun/step-3.5-flash-2603 as the model field with the TrustedRouter OpenAI-compatible API. Credits routing and provider fallback happen behind that model ID.

Which providers serve Step 3.5 Flash 2603?

TrustedRouter currently lists StepFun for Step 3.5 Flash 2603. Provider availability and routing eligibility can change as catalog and health data update.

How much does Step 3.5 Flash 2603 cost through TrustedRouter?

The current lowest Credits input price is $0.1055/1M and the lowest Credits output price is $0.3165/1M. Prices are per one million tokens and come from the current route catalog.

How do I require zero data retention for Step 3.5 Flash 2603?

Set provider.min_privacy to zdr on the request. TrustedRouter considers only routes with a recorded zero-data-retention posture and fails closed if no eligible route remains.