Tuesday, July 7, 2026 · No. 345Prices synced within the hour
All·AI·Model

The AI Model Price Index

Step 3.5 Flash 2603

by StepFun · listed Apr 2026RTW

StepFun flash model for efficient multimodal reasoning, coding, and tool use

Current rates USD per 1M tokens

Input$0.10
Output$0.30
Cache read$0.02
Cache write—

Against the market

Input price vs. maker flagships ($/1M tokens)
Step 3.5 Flash 2603Step 3.5 Flash 2603: $0.10 per 1M tokens$0.10DeepSeek V4 FlashDeepSeek V4 Flash: $0.14 per 1M tokens$0.14Qwen3.7 PlusQwen3.7 Plus: $0.50 per 1M tokens$0.50Grok 4.3Grok 4.3: $1.25 per 1M tokens$1.25Gemini 3.5 FlashGemini 3.5 Flash: $1.50 per 1M tokens$1.50Mistral Medium (latest)Mistral Medium (latest): $1.50 per 1M tokens$1.50Claude Sonnet 5Claude Sonnet 5: $2.00 per 1M tokens$2.00GPT-5.5 ProGPT-5.5 Pro: $30.00 per 1M tokens$30.00
Output price vs. maker flagships ($/1M tokens)
DeepSeek V4 FlashDeepSeek V4 Flash: $0.28 per 1M tokens$0.28Step 3.5 Flash 2603Step 3.5 Flash 2603: $0.30 per 1M tokens$0.30Grok 4.3Grok 4.3: $2.50 per 1M tokens$2.50Qwen3.7 PlusQwen3.7 Plus: $3.00 per 1M tokens$3.00Mistral Medium (latest)Mistral Medium (latest): $7.50 per 1M tokens$7.50Gemini 3.5 FlashGemini 3.5 Flash: $9.00 per 1M tokens$9.00Claude Sonnet 5Claude Sonnet 5: $10.00 per 1M tokens$10.00GPT-5.5 ProGPT-5.5 Pro: $180 per 1M tokens$180

On the record

Model id
step-3.5-flash-2603
Context window
256K tokens
Max output
256K tokens
Input modalities
text
Output modalities
text
Reasoning
yes
Tool calls
yes
Open weights
yes
Knowledge cutoff
Jan 2025
Released
2026-04-02
Last updated
2026-04-02
Provider docs
platform.stepfun.com/docs/zh/overview/concept

Back of the envelope

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