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 window, it delivers more acc…
Model details →AI21: Jamba Large 1.7 vs OpenAI: GPT-5.1-Codex
OpenAI: GPT-5.1-Codex wins on 4 of 6 axes — pricing and capability skew in its favour for most workloads.
GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks. The model supp…
Model details →Side-by-side comparison
| Capability | AI21: Jamba Large 1.7 | OpenAI: GPT-5.1-Codex | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 256K | 400K | 🏆 OpenAI: GPT-5.1-Codex |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $2.00 | $1.25 | 🏆 OpenAI: GPT-5.1-Codex |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $8.00 | $10.00 | 🏆 AI21: Jamba Large 1.7 |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | — | Yes | 🏆 OpenAI: GPT-5.1-Codex |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | — | Yes | 🏆 OpenAI: GPT-5.1-Codex |
Frequently asked questions
Is AI21: Jamba Large 1.7 better than OpenAI: GPT-5.1-Codex?
OpenAI: GPT-5.1-Codex wins on 4 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 OpenAI: GPT-5.1-Codex?
Input: $2.00 vs $1.25 per 1M tokens. Output: $8.00 vs $10.00 per 1M tokens.
What context windows do AI21: Jamba Large 1.7 and OpenAI: GPT-5.1-Codex support?
AI21: Jamba Large 1.7 supports up to 256K tokens. OpenAI: GPT-5.1-Codex supports up to 400K tokens.
Do both AI21: Jamba Large 1.7 and OpenAI: GPT-5.1-Codex support tool calling?
AI21: Jamba Large 1.7: yes. OpenAI: GPT-5.1-Codex: yes.