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Step 3.5 Flash vs Claude Haiku 5.5

At a glance

StepFun's fast and efficient language model.

262K ctx$0.10/$0.30 per M

Anthropic's fast, low-cost Claude Haiku for high-volume work, succeeding Claude Haiku 4.5.

1M ctx$0.10/$0.50 per M
Demos
All demos

No shared demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Cheaper25%
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Specs
262K
Context
66K
Max output
Jan 2026
Released
1M
Context
128K
Max output
Oct 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$0.10/M tokens
Output40%$0.30/M tokens
Live pricing, shown before you run
Input$0.10/M tokens
Output$0.50/M tokens
Cache read$0.01/M tokens
Cache write$0.13/M tokens
Web search$0.01/search
Chat with Step 3.5 FlashGo to model
Chat with Claude Haiku 5.5Go to model
Frequently Asked Questions: Step 3.5 Flash vs Claude Haiku 5.5▼

Which is better, Step 3.5 Flash or Claude Haiku 5.5?

▼

Both Step 3.5 Flash and Claude Haiku 5.5 are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, Step 3.5 Flash or Claude Haiku 5.5?

▼

Step 3.5 Flash has a lower blended cost. Step 3.5 Flash: $0.10 input / $0.30 output. Claude Haiku 5.5: $0.10 input / $0.50 output.

Which has a larger context window, Step 3.5 Flash or Claude Haiku 5.5?

▼

Claude Haiku 5.5 has a larger context window: Step 3.5 Flash supports 262K tokens vs Claude Haiku 5.5 at 1M tokens.

Do both Step 3.5 Flash and Claude Haiku 5.5 support vision?

▼

Claude Haiku 5.5 supports vision/image input, but Step 3.5 Flash does not.

What are the key differences between Step 3.5 Flash and Claude Haiku 5.5?

▼

Key differences: only Claude Haiku 5.5 supports vision input. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both Step 3.5 Flash and Claude Haiku 5.5 for free on idapt.app to see which performs better for your specific needs.

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