Jamba 1.5 Large vs Llama 4 405B
A complete head-to-head: pricing, context window, benchmarks, modality coverage, and openness, with a programmatic verdict synthesized from the underlying data.
Updated
Jamba 1.5 Large specs · Llama 4 405B specs- PriceJamba 1.5 Large
Jamba 1.5 Large publishes pricing ($8.00 / 1M output tokens) while Llama 4 405B does not.
- Context windowTie
Both ship a 256K-token context window.
- BenchmarksTie
No directly comparable public benchmarks are available for both models, check the spec sheets for individual scores.
- ModalitiesLlama 4 405B
Llama 4 405B supports 2 modalities (text, vision) vs 1 for Jamba 1.5 Large.
- OpennessTie
Both ship open weights, self-host either one.
It's a genuine coin-flip between Jamba 1.5 Large and Llama 4 405B: 1 category wins each, with the rest tied. Jamba 1.5 Large publishes pricing ($8.00 / 1M output tokens) while Llama 4 405B does not. Both ship a 256K-token context window.
No directly comparable public benchmarks are available for both models, check the spec sheets for individual scores. They differ in modality coverage, Jamba 1.5 Large handles text while Llama 4 405B handles text, vision, which can be the deciding factor before you even look at benchmarks. Both ship open weights, self-host either one.
Llama 4 405B is the newer of the two, released 8 months after Jamba 1.5 Large, which usually means a more recent knowledge cutoff and updated safety post-training. Jamba 1.5 Large is usually picked for long context and rag workloads, while Llama 4 405B sees more deployments in open source llm and fine tuning. If pricing matters more than every last benchmark point, run the numbers in the calculator below before committing.
Side-by-side specs
| Spec | Jamba 1.5 Large | Llama 4 405B |
|---|---|---|
| Provider | AI21 | Meta |
| Released | Aug 2024 | Apr 2025 |
| Modalities | text | text, vision |
| Context window | 256K tokens | 256K tokens |
| Max output | , | , |
| Input · 1M | $2.00 / 1M tokens | Pricing not published |
| Output · 1M | $8.00 / 1M tokens | Pricing not published |
| Knowledge cutoff | , | 2024-12 |
| Open weights | Yes (Jamba Open Model License) | Yes (Llama 4 Community License) |
| API available | Yes | Yes |
Pricing at scale
What you'd actually pay at typical workloads. Numbers come from each model's published per-million-token rates.
- Light usage, 100k in / 50k out per day$18.00 vs ,
- Heavy usage, 1M in / 500k out per day$180 vs ,
- RAG workload, 5M in / 200k out per day$348 vs ,
Light usage, 100k in / 50k out per day: pricing not directly comparable (one or both models are missing public per-token rates). Heavy usage, 1M in / 500k out per day: pricing not directly comparable (one or both models are missing public per-token rates). RAG workload, 5M in / 200k out per day: pricing not directly comparable (one or both models are missing public per-token rates).
Estimated spend for the listed models at your usage. Numbers are derived from each model's published per-million-token rates.
- Jamba 1.5 Large$0.600
- Llama 4 405BPricing unavailable
Benchmarks compared
Only sourced numbers. Where a benchmark is missing for one model we show the available value rather than fabricating the other.
Jamba 1.5 Large fits when…
- 256k context
- Efficient long-context inference
- Open weights
Llama 4 405B fits when…
- Strongest open-weight model at launch
- Multimodal (text + vision)
- Wide hosting availability
- Multimodal needs covering vision.
Consider Jamba 1.5 Mini
Smaller hybrid SSM-Transformer model, fast and efficient at long contexts.
Frequently asked
Is Jamba 1.5 Large or Llama 4 405B cheaper?
Per-token pricing isn't published for at least one of these models, check each model's spec page for current rates.Which has the larger context window?
Both Jamba 1.5 Large and Llama 4 405B ship a 256K-token context window.Is Jamba 1.5 Large or Llama 4 405B better for coding?
Both Jamba 1.5 Large and Llama 4 405B are competitive on coding benchmarks. See each model's individual spec page for HumanEval and SWE-bench scores where published. For an opinionated pick, consult our Best LLM for Coding ranking.Are either of these models open source?
Both ship with open weights. Jamba 1.5 Large is licensed under Jamba Open Model License; Llama 4 405B under Llama 4 Community License.When were Jamba 1.5 Large and Llama 4 405B released?
Jamba 1.5 Large was released by AI21 on 2024-08-22. Llama 4 405B was released by Meta on 2025-04-05.
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