Jamba Large 1.7 is the latest model in the Jamba open family, offering improvements in grounding, instruction-following, and overall efficiency. Built on a hybrid SSM-Transformer architecture with a 256K context...
Model details →AI21: Jamba Large 1.7 vs StepFun: Step 5 Preview
StepFun: Step 5 Preview wins on 5 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 | AI21: Jamba Large 1.7 | StepFun: Step 5 Preview | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 256K | 1M | 🏆 StepFun: Step 5 Preview |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $2.00 | $1.00 | 🏆 StepFun: Step 5 Preview |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $8.00 | $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 | 🏆 StepFun: Step 5 Preview |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | — | Yes | 🏆 StepFun: Step 5 Preview |
Frequently asked questions
Is AI21: Jamba Large 1.7 better than StepFun: Step 5 Preview?
StepFun: Step 5 Preview wins on 5 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between AI21: Jamba Large 1.7 and StepFun: Step 5 Preview?
Input: $2.00 vs $1.00 per 1M tokens. Output: $8.00 vs $2.70 per 1M tokens.
What context windows do AI21: Jamba Large 1.7 and StepFun: Step 5 Preview support?
AI21: Jamba Large 1.7 supports up to 256K tokens. StepFun: Step 5 Preview supports up to 1M tokens.
Do both AI21: Jamba Large 1.7 and StepFun: Step 5 Preview support tool calling?
AI21: Jamba Large 1.7: yes. StepFun: Step 5 Preview: yes.