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Best AI model for research — November 2026

On BenchLM's public evidence, Claude Opus 5.5 has the highest knowledge score estimate among the models that meet this page's constraints (89.4). Exam performance does not establish citation accuracy or browsing quality.

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The shortlist for research

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 Claude Opus 5.5 vs GPT-6.1 SolFull knowledge leaderboard

  1. 01Claude Opus 5.5Best fit

    Anthropic · Proprietary

    89.4

    Knowledge score estimate

    • Highest knowledge estimate among candidates passing the measured filters
    • $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.

    Model page and evidence

  2. 02GPT-6.1 Sol

    OpenAI · Proprietary

    85.9

    Knowledge score estimate

    • Estimate 85.9 on the same knowledge 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.

    Model page and evidenceCompare with Claude Opus 5.5

  3. 03Claude Fable 5.1

    Anthropic · Proprietary

    85.8

    Knowledge score estimate

    • Estimate 85.8 on the same knowledge evidence
    • $20.00 for the stated workload
    • 1M context
    • Anthropic says Fable 5.1 is available on all platforms. Enterprise Frontier Safeguards will roll out in phases; eligible customers can use zero data retention until EFS is ready. Access details · checked September 1, 2026.
    • Provider API offer: Claude API. Check which models qualify and whether payment details are required. Limits and source.

    Model page and evidenceCompare with Claude Opus 5.5

  4. 04GPT-6 Astra

    OpenAI · Proprietary

    85.5

    Knowledge score estimate

    • Estimate 85.5 on the same knowledge 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.

    Model page and evidenceCompare with Claude Opus 5.5

  5. 05Claude Sonnet 5.5

    Anthropic · Proprietary

    81.7

    Knowledge score estimate

    • Estimate 81.7 on the same knowledge evidence
    • $4.00 for the stated workload
    • 1M context
    • Anthropic lists the model ID on each documented platform. Access details · checked September 28, 2026.
    • Provider API offer: Claude API. Check which models qualify and whether payment details are required. Limits and source.

    Model page and evidenceCompare with Claude Opus 5.5

Refine for your situation

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What this shortlist rests on

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

What to verify before choosing

  • Exam performance does not establish citation accuracy or browsing quality.
  • 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 AI model is best for research?

On BenchLM's public evidence, Claude Opus 5.5 by Anthropic has the highest knowledge score estimate among models that meet the page's default constraints (89.4). Ordered by task score under the stated constraints. Exam performance does not establish citation accuracy or browsing quality.

What are the alternatives to Claude Opus 5.5 for research?

GPT-6.1 Sol (85.9), Claude Fable 5.1 (85.8), GPT-6 Astra (85.5), Claude Sonnet 5.5 (81.7) 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 model for research?

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 knowledge 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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