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Step 3.5 Flash 2603

StepFun AIOpen weights

Step 3.5 Flash 2603 by StepFun AI costs $0.10 per 1M input tokens and $0.30 per 1M output tokens, with a 256K-token context window.

Pricing

Input (per 1M tokens)
$0.10
Output (per 1M tokens)
$0.30
Cached input (per 1M)
$0.02

Specifications

Provider
StepFun AI
Context window
256K tokens
Parameters
—
Released
Apr 2026
Open weights
Yes
Frontier model
No

Compare Step 3.5 Flash 2603 with…

Step 3.5 Flash 2603 vs GPT-5.1$9.00/1MStep 3.5 Flash 2603 vs Claw Low$1.50/1MStep 3.5 Flash 2603 vs Gemini 3 Pro Image$12.00/1MStep 3.5 Flash 2603 vs Gemma 4 31B Garnet$0.31/1MStep 3.5 Flash 2603 vs Phi-4$0.50/1MStep 3.5 Flash 2603 vs Doubao 1.5 Vision Pro 32k$1.38/1M

FAQ

Pricing is per 1M tokens (USD); confirm with the provider before production use.