Claude Haiku 4.5 vs StepFun Step-2
Claude Haiku 4.5 (2025) and StepFun Step-2 (2025) are compact production models from Anthropic and StepFun. Claude Haiku 4.5 ships a 200k-token context window, while StepFun Step-2 ships a 128k-token context window. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads. It focuses on practical selection signals rather than broad model-family marketing.
StepFun Step-2 is safer overall; choose Claude Haiku 4.5 when coding workflow support matters.
Decision scorecard
Local evidence first| Signal | Claude Haiku 4.5 | StepFun Step-2 |
|---|---|---|
| Best for | multimodal apps, tool-calling agents, and provider-routed production | general production evaluation |
| Decision fit | Coding, RAG, and Agents | Long context |
| Context window | 200k | 128k |
| Cheapest output | $4/1M tokens | - |
| Provider routes | 9 tracked | 0 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- Claude Haiku 4.5 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Claude Haiku 4.5 has broader tracked provider coverage for fallback and route flexibility.
- Claude Haiku 4.5 uniquely exposes Vision, Multimodal, and JSON / Tool use in local model data.
- Local decision data tags Claude Haiku 4.5 for Coding, RAG, and Agents.
- Local decision data tags StepFun Step-2 for Long context.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Claude Haiku 4.5
$1,640
Cheapest tracked route/tier: AWS Bedrock
StepFun Step-2
Unavailable
No complete token price in local provider data
Cost delta unavailable until both models have sourced input and output token prices.
Switch friction
- No overlapping tracked provider route is sourced for Claude Haiku 4.5 and StepFun Step-2; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Vision, Multimodal, and JSON / Tool use before moving production traffic.
- No overlapping tracked provider route is sourced for StepFun Step-2 and Claude Haiku 4.5; plan for SDK, billing, or endpoint changes.
- Claude Haiku 4.5 adds Vision, Multimodal, and JSON / Tool use in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-10-01 | 2025-10-15 |
| Context window | 200k | 128k |
| Parameters | — | 1T (MoE)* |
| Architecture | Decoder Only | - |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Weights | Not released | Not released |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: conditional |
| Knowledge cutoff | 2025-02 | - |
Pricing and availability
| Pricing attribute | Claude Haiku 4.5 | StepFun Step-2 |
|---|---|---|
| Input price | $0.80/1M tokens | - |
| Output price | $4/1M tokens | - |
| Providers | - |
Capabilities
| Capability | Claude Haiku 4.5 | StepFun Step-2 |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | No |
| Reasoning | No | No |
| JSON / Tool use | Yes | No |
| Structured outputs | Yes | No |
| Code execution | Yes | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark scores are currently available for this pair.
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Last reviewed: 2026-07-26. Data sourced from public model cards and provider documentation.