Choose AI21: Jamba Large 1.7 if…
No advantage on the data we track — pick it for provider preference or output quality on your own prompts.
AI21: Jamba Large 1.7 vs DeepSeek: DeepSeek V4.1 Flash
DeepSeek: DeepSeek V4.1 Flash comes out ahead on the data we track: 8 advantages and none for AI21: Jamba Large 1.7.
Key numbers
| Spec | AI21: Jamba Large 1.7 | DeepSeek: DeepSeek V4.1 Flash |
|---|---|---|
| Provider | AI21 | DeepSeek |
| Input price (per 1M tokens) | $2.00 | $0.14 |
| Output price (per 1M tokens) | $8.00 | $0.42 |
| Blended price (3:1 input/output) | $3.50 | $0.21 |
| Cheaper than … of all models we track | 18% | 70% |
| Context window | 256K tokens (~384 pages) | 1.0M tokens (~1,573 pages) |
| Larger context than … of all models | 44% | 80% |
| Max output per response | 4K tokens (~3,100 words) | 131K tokens (~98,300 words) |
| Input types | text | text, image |
| Output types | text | text |
| Free variant | No | No |
| Listed since | 2025-08-08 | 2026-09-10 |
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What it costs for real workloads
Monthly cost at list price for five common workloads. Token counts per unit are stated so you can scale them to your own traffic. A workload that does not fit a model's context window is marked rather than priced.
| Workload (per month) | AI21: Jamba Large 1.7 | DeepSeek: DeepSeek V4.1 Flash | Difference |
|---|---|---|---|
| Customer-support chatbot 50,000 conversations — each a 6-turn conversation (1,500 in / 400 out tokens) | $310 | $18.90 | DeepSeek: DeepSeek V4.1 Flash saves $291 |
| RAG search over documents 20,000 questions — each a question answered from ~8 retrieved passages (6,000 in / 500 out tokens) | $320 | $21.00 | DeepSeek: DeepSeek V4.1 Flash saves $299 |
| Coding / tool-using agent 2,000 tasks — each a multi-step task with tool calls and file context (60,000 in / 6,000 out tokens) | $336 | $21.84 | DeepSeek: DeepSeek V4.1 Flash saves $314 |
| Batch summarisation 10,000 documents — each a 6,000-word report summarised to a page (8,000 in / 600 out tokens) | $208 | $13.72 | DeepSeek: DeepSeek V4.1 Flash saves $194 |
| Long-document analysis 500 documents — each a 150-page contract or codebase read in one pass (100,000 in / 2,000 out tokens) | $108 | $7.42 | DeepSeek: DeepSeek V4.1 Flash saves $101 |
Capabilities side by side
| Capability | AI21: Jamba Large 1.7 | DeepSeek: DeepSeek V4.1 Flash | What it lets you do |
|---|---|---|---|
| Tool / function calling | ✓ Yes | ✓ Yes | call your APIs and run agent loops |
| Structured output (JSON schema) | ✓ Yes | ✓ Yes | return JSON that validates against your schema |
| Reasoning / thinking mode | — | ✓ Yes | spend extra tokens thinking before answering hard problems |
| Image input | — | ✓ Yes | read screenshots, charts and scanned pages |
| Audio input | — | — | take speech or audio directly |
| File / PDF input | — | — | accept documents without your own parsing step |
| Image output | — | — | generate images, not just text |
| Built-in web search | — | — | answer from live web results |
| Seed (reproducible sampling) | — | ✓ Yes | repeat a generation for tests and evals |
| Log-probabilities | — | ✓ Yes | read token confidence for classification and scoring |
From each model's published parameters and input/output types. “—” means not advertised, not proven absent.
Price history
- AI21: Jamba Large 1.7: price unchanged since we started tracking it on 2026-03-10.
- DeepSeek: DeepSeek V4.1 Flash: input price raised 86% ($0.02 → $0.14/1M), output price cut 58% ($1.00 → $0.42/1M) on 2026-10-27 (28 price changes since 2026-09-11).
| Date | Model | Input / 1M | Output / 1M |
|---|---|---|---|
| 2026-10-27 | DeepSeek: DeepSeek V4.1 Flash | $0.14 | $0.42 |
| 2026-10-24 | DeepSeek: DeepSeek V4.1 Flash | $0.02 | $1.00 |
| 2026-10-23 | DeepSeek: DeepSeek V4.1 Flash | $0.17 | $0.66 |
| 2026-10-22 | DeepSeek: DeepSeek V4.1 Flash | $0.30 | $1.20 |
| 2026-10-21 | DeepSeek: DeepSeek V4.1 Flash | $0.05 | $0.53 |
| 2026-10-20 | DeepSeek: DeepSeek V4.1 Flash | $0.04 | $0.01 |
| 2026-10-19 | DeepSeek: DeepSeek V4.1 Flash | $0.05 | $0.12 |
| 2026-10-18 | DeepSeek: DeepSeek V4.1 Flash | $0.07 | $0.14 |
Which should you choose?
Choose DeepSeek: DeepSeek V4.1 Flash if…
- cost matters at scale — it is 94% cheaper on a typical 3:1 input/output mix ($18.90 vs $310 a month for 50,000 support chats)
- you need to fit long inputs in one request — 1.0M tokens is roughly 1,573 pages, against 384
- you need reasoning / thinking mode — to spend extra tokens thinking before answering hard problems; AI21: Jamba Large 1.7 does not advertise it
- you need image input — to read screenshots, charts and scanned pages; AI21: Jamba Large 1.7 does not advertise it
- you need seed (reproducible sampling) — to repeat a generation for tests and evals; AI21: Jamba Large 1.7 does not advertise it
- you need log-probabilities — to read token confidence for classification and scoring; AI21: Jamba Large 1.7 does not advertise it
- you generate long outputs in one go — up to 131K tokens (about 98,300 words) per response
- you want the newer model — released 2026-09-10, 13 months after the other
Frequently asked questions
Is AI21: Jamba Large 1.7 better than DeepSeek: DeepSeek V4.1 Flash?
DeepSeek: DeepSeek V4.1 Flash comes out ahead on the data we track: 8 advantages and none for AI21: Jamba Large 1.7.
Which is cheaper, AI21: Jamba Large 1.7 or DeepSeek: DeepSeek V4.1 Flash?
DeepSeek: DeepSeek V4.1 Flash is cheaper: $0.21 vs $3.50 per 1M tokens at a typical 3:1 input/output mix, 94% less. For 50,000 support conversations a month that is $18.90 against $310.
How much do AI21: Jamba Large 1.7 and DeepSeek: DeepSeek V4.1 Flash cost per million tokens?
AI21: Jamba Large 1.7 costs $2.00 per 1M input tokens and $8.00 per 1M output tokens; DeepSeek: DeepSeek V4.1 Flash costs $0.14 input and $0.42 output. Output tokens are billed separately, so long answers shift the gap.
Which has the bigger context window, AI21: Jamba Large 1.7 or DeepSeek: DeepSeek V4.1 Flash?
DeepSeek: DeepSeek V4.1 Flash: 1.0M tokens, about 1,573 pages, against 256K (about 384 pages) for AI21: Jamba Large 1.7.
Do AI21: Jamba Large 1.7 and DeepSeek: DeepSeek V4.1 Flash support function calling and JSON output?
Tool calling — AI21: Jamba Large 1.7: yes, DeepSeek: DeepSeek V4.1 Flash: yes. JSON-schema structured output — AI21: Jamba Large 1.7: yes, DeepSeek: DeepSeek V4.1 Flash: yes.
Can AI21: Jamba Large 1.7 or DeepSeek: DeepSeek V4.1 Flash read images?
Only DeepSeek: DeepSeek V4.1 Flash accepts image input; AI21: Jamba Large 1.7 is text-only for input.
Is AI21: Jamba Large 1.7 or DeepSeek: DeepSeek V4.1 Flash free to use?
No free variant is listed for either; both are pay-per-token.
What is the maximum output length of AI21: Jamba Large 1.7 and DeepSeek: DeepSeek V4.1 Flash?
AI21: Jamba Large 1.7 can write up to 4K tokens (about 3,100 words) per response; DeepSeek: DeepSeek V4.1 Flash up to 131K (about 98,300 words).
When were AI21: Jamba Large 1.7 and DeepSeek: DeepSeek V4.1 Flash released?
AI21: Jamba Large 1.7 was listed on 2025-08-08; DeepSeek: DeepSeek V4.1 Flash on 2026-09-10.
Has the price of AI21: Jamba Large 1.7 or DeepSeek: DeepSeek V4.1 Flash changed?
AI21: Jamba Large 1.7: price unchanged since we started tracking it on 2026-03-10. DeepSeek: DeepSeek V4.1 Flash: input price raised 86% ($0.02 → $0.14/1M), output price cut 58% ($1.00 → $0.42/1M) on 2026-10-27 (28 price changes since 2026-09-11).
About the two models
AI21: Jamba Large 1.7
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...
Full AI21: Jamba Large 1.7 specs →DeepSeek: DeepSeek V4.1 Flash
DeepSeek V4.1 Flash is a sparse mixture-of-experts model from DeepSeek, and the first built on the company's Causal Encoder-Decoder (CED) architecture. It activates 8B parameters on input and 16B on...
Full DeepSeek: DeepSeek V4.1 Flash specs →