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GPT-5.5 vs Jamba 1.5 Mini

A complete head-to-head: pricing, context window, benchmarks, modality coverage, and openness, with a programmatic verdict synthesized from the underlying data.

Updated

GPT-5.5 specs · Jamba 1.5 Mini specs
Verdict by category
  • PriceJamba 1.5 Mini

    Jamba 1.5 Mini publishes pricing ($0.40 / 1M output tokens) while GPT-5.5 does not.

  • Context windowGPT-5.5

    GPT-5.5 accepts 400K tokens vs 256K, 1.6× 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.

  • ModalitiesGPT-5.5

    GPT-5.5 supports 3 modalities (text, vision, audio) vs 1 for Jamba 1.5 Mini.

  • OpennessJamba 1.5 Mini

    Jamba 1.5 Mini ships open weights (Jamba Open Model License); GPT-5.5 is API-only.

It's a genuine coin-flip between GPT-5.5 and Jamba 1.5 Mini: 2 category wins each, with the rest tied. Jamba 1.5 Mini publishes pricing ($0.40 / 1M output tokens) while GPT-5.5 does not. GPT-5.5 accepts 400K tokens vs 256K, 1.6× the room for long documents and codebases.

No directly comparable public benchmarks are available for both models, check the spec sheets for individual scores. They differ in modality coverage, GPT-5.5 handles text, vision, audio while Jamba 1.5 Mini handles text, which can be the deciding factor before you even look at benchmarks. Jamba 1.5 Mini ships open weights (Jamba Open Model License); GPT-5.5 is API-only.

GPT-5.5 is the newer of the two, released 19 months after Jamba 1.5 Mini, which usually means a more recent knowledge cutoff and updated safety post-training. GPT-5.5 is usually picked for agents and tool use workloads, while Jamba 1.5 Mini sees more deployments in long context and summarization. If pricing matters more than every last benchmark point, run the numbers in the calculator below before committing.

Side-by-side specs

SpecGPT-5.5Jamba 1.5 Mini
ProviderOpenAIAI21
ReleasedMar 2026Aug 2024
Modalitiestext, vision, audiotext
Context window400K tokens256K tokens
Max output,,
Input · 1MPricing not published$0.20 / 1M tokens
Output · 1MPricing not published$0.40 / 1M tokens
Knowledge cutoff,,
Open weightsNoYes (Jamba Open Model License)
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, vs $1.20
  • Heavy usage, 1M in / 500k out per day, vs $12.00
  • RAG workload, 5M in / 200k out per day, vs $32.40

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).

Price calculator

Estimated spend for the listed models at your usage. Numbers are derived from each model's published per-million-token rates.

  • GPT-5.5Pricing unavailable
  • Jamba 1.5 Mini$0.040

Benchmarks compared

Only sourced numbers. Where a benchmark is missing for one model we show the available value rather than fabricating the other.

Benchmark scores not yet available. We only publish numbers we can source from official model cards or independent leaderboards, see methodology.
Pick GPT-5.5 if

GPT-5.5 fits when…

  • Industry-leading tool-use and function-calling reliability
  • Strong end-to-end agent performance across SWE-bench and GAIA
  • Wide ecosystem support, ChatGPT, Realtime API, Responses API
  • Long-context tasks, handles 400K tokens vs 256K for Jamba 1.5 Mini.
  • Multimodal needs covering vision, audio.
Pick Jamba 1.5 Mini if

Jamba 1.5 Mini fits when…

  • 256k context at small-model price
  • Hybrid SSM-Transformer is efficient on long inputs
  • Open weights for self-hosting
  • Self-hosting and on-prem requirements, open weights (Jamba Open Model License).
Don't want either?

Consider GPT-5

OpenAI's unified flagship combining GPT-line breadth with built-in reasoning, replacing both GPT-4o and the o-series for most users.

See GPT-5 specsGPT-5.5 vs GPT-5Jamba 1.5 Mini vs GPT-5

Frequently asked

  • Is GPT-5.5 or Jamba 1.5 Mini 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?
    GPT-5.5 accepts 400K tokens vs 256K for Jamba 1.5 Mini.
  • Is GPT-5.5 or Jamba 1.5 Mini better for coding?
    Both GPT-5.5 and Jamba 1.5 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 Mini ships open weights (Jamba Open Model License). GPT-5.5 is API-only.
  • When were GPT-5.5 and Jamba 1.5 Mini released?
    GPT-5.5 was released by OpenAI on 2026-03-01. Jamba 1.5 Mini was released by AI21 on 2024-08-22.
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