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Jamba 1.5 Large vs o3-mini

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 · o3-mini specs
Verdict by category
  • Priceo3-mini

    o3-mini is roughly 1.8× cheaper on output tokens ($4.40 vs $8.00 per 1M).

  • Context windowJamba 1.5 Large

    Jamba 1.5 Large accepts 256K tokens vs 200K, 1.3× the room for long documents and codebases.

  • BenchmarksTie

    No directly comparable public benchmarks are available for both models, check the spec sheets for individual scores.

  • ModalitiesTie

    Both handle text.

  • OpennessJamba 1.5 Large

    Jamba 1.5 Large ships open weights (Jamba Open Model License); o3-mini is API-only.

On balance Jamba 1.5 Large edges ahead, winning 2 of 5 categories against o3-mini's 1. o3-mini is roughly 1.8× cheaper on output tokens ($4.40 vs $8.00 per 1M). Jamba 1.5 Large accepts 256K tokens vs 200K, 1.3× the room for long documents and codebases.

No directly comparable public benchmarks are available for both models, check the spec sheets for individual scores. Both target the same set of modalities (text), so the deciding factors are price, context, and raw quality. Jamba 1.5 Large ships open weights (Jamba Open Model License); o3-mini is API-only.

o3-mini is the newer of the two, released 5 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 o3-mini sees more deployments in reasoning and math. If pricing matters more than every last benchmark point, run the numbers in the calculator below before committing.

Side-by-side specs

SpecJamba 1.5 Largeo3-mini
ProviderAI21OpenAI
ReleasedAug 2024Jan 2025
Modalitiestexttext
Context window256K tokens200K tokens
Max output,,
Input · 1M$2.00 / 1M tokens$1.10 / 1M tokens
Output · 1M$8.00 / 1M tokens$4.40 / 1M tokens
Knowledge cutoff,2023-10
Open weightsYes (Jamba Open Model License)No
API availableYesYes

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 $9.90
  • Heavy usage, 1M in / 500k out per day$180 vs $99.00
  • RAG workload, 5M in / 200k out per day$348 vs $191

Light usage, 100k in / 50k out per day: $18.00 vs $9.90 per month, model B comes out ahead. Heavy usage, 1M in / 500k out per day: $180 vs $99.00 per month, model B comes out ahead. RAG workload, 5M in / 200k out per day: $348 vs $191 per month, model B comes out ahead.

Price calculator

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
  • o3-mini$0.330

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 Largeo3-mini
  • GPQA,79.7
Pick Jamba 1.5 Large if

Jamba 1.5 Large fits when…

  • 256k context
  • Efficient long-context inference
  • Open weights
  • Self-hosting and on-prem requirements, open weights (Jamba Open Model License).
Pick o3-mini if

o3-mini fits when…

  • Reasoning at mid-tier cost
  • Fast for a thinking model
  • Cost-sensitive workloads, 1.8× cheaper than Jamba 1.5 Large on output tokens.
Don't want either?

Consider Jamba 1.5 Mini

Smaller hybrid SSM-Transformer model, fast and efficient at long contexts.

See Jamba 1.5 Mini specsJamba 1.5 Large vs Jamba 1.5 Minio3-mini vs Jamba 1.5 Mini

Frequently asked

  • Is Jamba 1.5 Large or o3-mini cheaper?
    o3-mini is cheaper at $4.40 / 1M tokens per million output tokens, vs $8.00 / 1M tokens for Jamba 1.5 Large.
  • Which has the larger context window?
    Jamba 1.5 Large accepts 256K tokens vs 200K for o3-mini.
  • Is Jamba 1.5 Large or o3-mini better for coding?
    Both Jamba 1.5 Large and o3-mini 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?
    Jamba 1.5 Large ships open weights (Jamba Open Model License). o3-mini is API-only.
  • When were Jamba 1.5 Large and o3-mini released?
    Jamba 1.5 Large was released by AI21 on 2024-08-22. o3-mini was released by OpenAI on 2025-01-31.
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