Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...
Model details →Anthropic: Claude Sonnet 4.5 (batch) vs StepFun: Step 5 Preview
StepFun: Step 5 Preview wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional...
Model details →Side-by-side comparison
| Capability | Anthropic: Claude Sonnet 4.5 (batch) | StepFun: Step 5 Preview | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 1M | 1M | Tie |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $1.50 | $1.00 | 🏆 StepFun: Step 5 Preview |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $7.50 | $2.70 | 🏆 StepFun: Step 5 Preview |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | Yes | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is Anthropic: Claude Sonnet 4.5 (batch) better than StepFun: Step 5 Preview?
StepFun: Step 5 Preview wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Anthropic: Claude Sonnet 4.5 (batch) and StepFun: Step 5 Preview?
Input: $1.50 vs $1.00 per 1M tokens. Output: $7.50 vs $2.70 per 1M tokens.
What context windows do Anthropic: Claude Sonnet 4.5 (batch) and StepFun: Step 5 Preview support?
Anthropic: Claude Sonnet 4.5 (batch) supports up to 1M tokens. StepFun: Step 5 Preview supports up to 1M tokens.
Do both Anthropic: Claude Sonnet 4.5 (batch) and StepFun: Step 5 Preview support tool calling?
Anthropic: Claude Sonnet 4.5 (batch): yes. StepFun: Step 5 Preview: yes.