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Best AI assistant — November 2026

On BenchLM's public evidence, Gemini 4 Carbon has the highest overall score estimate among the models that meet this page's constraints (88.7). The underlying model is only part of an assistant. Plan limits, browsing, memory, and integrations need app-level evidence.

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The shortlist for AI assistant

Constraints on this page: a builder choosing by accuracy, hosted processing allowed, any price, ordinary input size. Change any of them under Refine. A small score gap does not establish a reliably better model.

Compare Gemini 4 Carbon vs Claude Opus 5.5Full overall leaderboard

  1. 01Gemini 4 CarbonBest fit

    Google · Proprietary

    88.7

    Overall score estimate

    • Highest overall estimate among candidates passing the measured filters
    • $4.00 for the stated workload
    • API access is not verified. Check the provider documentation before relying on it.
    • Provider API offer: Gemini API (Google AI Studio). Check which models qualify and whether payment details are required. Limits and source.

    Estimate sources: LMArena Text Overall, Artificial Analysis

    Model page and evidence

  2. 02Claude Opus 5.5

    Anthropic · Proprietary

    86.3

    Overall score estimate

    • Estimate 86.3 on the same overall evidence
    • $8.00 for the stated workload
    • 1M context
    • Anthropic lists the model ID on each documented platform. Access details · checked September 22, 2026.
    • Provider API offer: Claude API. Check which models qualify and whether payment details are required. Limits and source.

    Estimate sources: LMArena Text Overall, Artificial Analysis, Epoch Capability Index

    Model page and evidenceCompare with Gemini 4 Carbon

  3. 03GPT-6 Astra

    OpenAI · Proprietary

    85.8

    Overall score estimate

    • Estimate 85.8 on the same overall evidence
    • $20.00 for the stated workload
    • 1.05M context
    • OpenAI says GPT-6 Astra is rolling out first to enterprises in its Trusted Access Program, with API, ChatGPT plan, Azure, and Bedrock access following in the coming days. Enterprise access is off by default; eligible API customers can use Zero Data Retention. Access details · checked September 3, 2026.
    • Provider API offer: OpenAI API, Free usage tier. Check which models qualify and whether payment details are required. Limits and source.

    Estimate sources: LMArena Text Overall, Artificial Analysis, Epoch Capability Index

    Model page and evidenceCompare with Gemini 4 Carbon

  4. 04GPT-6.1 Sol

    OpenAI · Proprietary

    85.4

    Overall score estimate

    • Estimate 85.4 on the same overall evidence
    • $4.00 for the stated workload
    • 1.05M context
    • OpenAI lists GPT-6.1 Sol as an API model. Use Responses for tool calling; Chat Completions supports the model without tool calling. Access details · checked September 29, 2026.
    • Provider API offer: OpenAI API, Free usage tier. Check which models qualify and whether payment details are required. Limits and source.

    Estimate sources: LMArena Text Overall, Artificial Analysis, Epoch Capability Index

    Model page and evidenceCompare with Gemini 4 Carbon

  5. 05Gemini 4 Argon

    Google · Proprietary

    82.1

    Overall score estimate

    • Estimate 82.1 on the same overall evidence
    • $4.00 for the stated workload
    • 1M context
    • Google lists gemini-4-argon as a stable model. Access details · checked October 13, 2026.
    • Provider API offer: Gemini API (Google AI Studio). Check which models qualify and whether payment details are required. Limits and source.

    Estimate sources: LMArena Text Overall, Artificial Analysis, Epoch Capability Index

    Model page and evidenceCompare with Gemini 4 Carbon

Refine for your situation

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What this shortlist rests on

The overall surface. Each model’s estimate names its own sources above; these are the public weighted benchmarks for the category.

What to verify before choosing

  • The underlying model is only part of an assistant. Plan limits, browsing, memory, and integrations need app-level evidence.
  • Composite scores are estimates. A small score gap does not establish a reliably better model.

Try three representative examples of your own work. Compare errors, time, cost, and the tools available in your actual setup.

Questions

Which is the best AI assistant?

On BenchLM's public evidence, Gemini 4 Carbon by Google has the highest overall score estimate among models that meet the page's default constraints (88.7). Ordered by task score under the stated constraints. The underlying model is only part of an assistant. Plan limits, browsing, memory, and integrations need app-level evidence.

What are the alternatives to Gemini 4 Carbon for AI assistant?

Claude Opus 5.5 (86.3), GPT-6 Astra (85.8), GPT-6.1 Sol (85.4), Gemini 4 Argon (82.1) follow on the same evidence. A small gap does not establish a reliably better model; compare them on three representative examples of your own work.

How does BenchLM pick the best ai assistant?

The page runs the LLM Selector with fixed answers: a builder choosing by accuracy, hosted processing allowed, any price, ordinary input size. The selector uses the overall evidence surface, filters by the stated constraints, and orders by that evidence. It never adds a hidden fit score or a bonus for open weights or reasoning style.

Can I change the constraints?

Yes. Every link under "Refine" opens the selector with one answer changed, and the address carries the answers so a result can be shared or reopened against the current dataset.

Method: bench-align-v5.8-2026-09-30. Read the methodology and benchmark confidence pages for how scores and verification statuses are produced.

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