grok-4.20-0309-reasoning vs jamba-large-1.7
grok-4.20-0309-reasoning and jamba-large-1.7 are priced within 15% of each other on input.
| grok-4.20-0309-reasoning | jamba-large-1.7 | |
|---|---|---|
| Input / 1M | $2.00 | $2.00 |
| Cached input / 1M | $0.20 | — |
| Output / 1M | $6.00 | $8.00 |
| Context window | 2M | 256K |
| Max output | 2M | 256K |
| Provider | xAI | AI21 |
| Vision | Yes | No |
| Tool calling | Yes | No |
| Token count | estimated | estimated |
Capability for the money
Independent measurement · Artificial Analysis · read 2026-08-11grok-4.20-0309-reasoning is 1.2× cheaper than jamba-large-1.7 and scores higher on every benchmark they share — there is no case for paying more here.
Following instructions
extraction, classification, sticking to a format
IFBenchgrok-4.20-0309-reasoning +47.7
Tool use
multi-step agent work against real tools
τ²-benchgrok-4.20-0309-reasoning +83.0
Hard reasoning
graduate-level science and multi-step analysis
GPQA Diamondgrok-4.20-0309-reasoning +49.5
Averaged over the benchmarks both models sat, grok-4.20-0309-reasoning returns 29.8 points of pass rate per dollar of blended price against 8.4 — the ratio that decides whether the dearer model earns its rate.
Each figure is a pass rate: the share of that test set the model answered correctly, measured by a third party rather than self-reported by the lab. Rows are different tests of different difficulty, so compare a model against the other model, not one row against the next. No published coding score for one of these models, so that lens is omitted. And a benchmark is not your workload — it narrows the shortlist, it does not pick for you.
Which to pick
- Cheaper input: grok-4.20-0309-reasoning
- Cheaper output: grok-4.20-0309-reasoning
- Larger context: grok-4.20-0309-reasoning
- Better at following instructions: grok-4.20-0309-reasoning (82.9% vs 35.2% on IFBench)
- Better at tool use: grok-4.20-0309-reasoning (96.5% vs 13.5% on τ²-bench)
- Better at hard reasoning: grok-4.20-0309-reasoning (88.5% vs 39.0% on GPQA Diamond)
List price is not production cost. Output length, cache hit rate, retries and task quality move the real number more than the headline rate does — price your own prompt on the token ledger before deciding.
Related comparisons
grok-4.20-0309-reasoning detail · jamba-large-1.7 detail · All xAI pricing · All comparisons