Simulating realistic AI coding assistant parameters (12,000 in / 2,000 out with 60% cache reuse). Claude Sonnet 5 delivers a 22% cost reduction over AI21 Jamba 1.5 Large.
Quick answer
For AI coding assistant, Claude Sonnet 5 is the lower-cost option at $0.031 per request versus $0.04 for AI21 Jamba 1.5 Large, a modeled saving of 22%.
Method & trust
The comparison uses 12,000 input tokens, 2,000 output tokens, and 60% cache reuse for the selected workload. Pricing is applied per model, then scaled to monthly request volumes.
| Traffic Volume Tier | AI21 Jamba 1.5 Large Monthly | Claude Sonnet 5 Monthly | Monthly Savings by picking Claude Sonnet 5 |
|---|---|---|---|
| 1,000 reqs/mo (Dev/Testing) | $40.00 | $31.04 | Save $8.96 / mo |
| 10,000 reqs/mo (Small App) | $400.00 | $310.40 | Save $89.60 / mo |
| 100,000 reqs/mo (Growth Production) | $4,000.00 | $3,104.00 | Save $896.00 / mo |
| 1,000,000 reqs/mo (Scale SaaS) | $40,000.00 | $31,040.00 | Save $8,960.00 / mo |
Claude Sonnet 5 is 22% cheaper for AI coding assistant workloads. At standard AI coding assistant parameter ratios (12,000 input tokens, 2,000 output tokens, 60% cache hit), Claude Sonnet 5 costs $0.031 per request compared to $0.04 on AI21 Jamba 1.5 Large.
AI21 Jamba 1.5 Large offers a context window of 256,000 tokens (max output: 4,096), while Claude Sonnet 5 offers 1,000,000 tokens (max output: 128,000).
At 100,000 requests per month, using Claude Sonnet 5 saves $896.00 every month (or $10,752.00 annually) compared to AI21 Jamba 1.5 Large.
Output is the expensive side — prefer models with cheap output for autocomplete-style calls. Cache repository context between keystrokes; diffs change far less than the full file. Measure acceptance rate: paying for output users delete is pure waste.