Qwen3.5 Plus 2026-02-15 vs Step 3.5 Flash: side-by-side summary

Qwen3.5 Plus 2026-02-15 and Step 3.5 Flash are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

Qwen3.5 Plus 2026-02-15, from Qwen, has a 1,000,000-token context window and is priced at $0.26/M tokens input, $1.56/M tokens output on OpenRouter.

Step 3.5 Flash, from stepfun, has a 262,144-token context window and is priced at $0.10/M tokens input, $0.30/M tokens output on OpenRouter.

Context window

• Qwen3.5 Plus 2026-02-15: 1,000,000 tokens
• Step 3.5 Flash: 262,144 tokens

Price

• Qwen3.5 Plus 2026-02-15: $0.26/M tokens input, $1.56/M tokens output
• Step 3.5 Flash: $0.10/M tokens input, $0.30/M tokens output

Provided by

• Qwen3.5 Plus 2026-02-15: Qwen
• Step 3.5 Flash: stepfun

• Qwen3.5 Plus 2026-02-15 model details, providers and pricing
• Step 3.5 Flash model details, providers and pricing