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Claude Sonnet 4.6 vs GLM-4.5

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

Updated

Claude Sonnet 4.6 specs · GLM-4.5 specs
Verdict by category
  • PriceTie

    Neither model publishes per-token API pricing.

  • Context windowClaude Sonnet 4.6

    Claude Sonnet 4.6 accepts 200K tokens vs 128K, 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.

  • ModalitiesTie

    Both handle text, vision.

  • OpennessGLM-4.5

    GLM-4.5 ships open weights (MIT); Claude Sonnet 4.6 is API-only.

It's a genuine coin-flip between Claude Sonnet 4.6 and GLM-4.5: 1 category wins each, with the rest tied. Neither model publishes per-token API pricing. Claude Sonnet 4.6 accepts 200K tokens vs 128K, 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. Both target the same set of modalities (text, vision), so the deciding factors are price, context, and raw quality. GLM-4.5 ships open weights (MIT); Claude Sonnet 4.6 is API-only.

Claude Sonnet 4.6 is the newer of the two, released 6 months after GLM-4.5, which usually means a more recent knowledge cutoff and updated safety post-training. Claude Sonnet 4.6 is usually picked for coding llm and code review workloads, while GLM-4.5 sees more deployments in chinese llm and open source llm. If pricing matters more than every last benchmark point, run the numbers in the calculator below before committing.

Side-by-side specs

SpecClaude Sonnet 4.6GLM-4.5
ProviderAnthropicOther
ReleasedJan 2026Jul 2025
Modalitiestext, visiontext, vision
Context window200K tokens128K tokens
Max output,,
Input · 1MPricing not publishedPricing not published
Output · 1MPricing not publishedPricing not published
Knowledge cutoff,,
Open weightsNoYes (MIT)
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 ,
  • Heavy usage, 1M in / 500k out per day, vs ,
  • RAG workload, 5M in / 200k out per day, 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).

Price calculator

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

  • Claude Sonnet 4.6Pricing unavailable
  • GLM-4.5Pricing unavailable

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 Claude Sonnet 4.6 if

Claude Sonnet 4.6 fits when…

  • Excellent quality-cost ratio
  • Strong for code review and writing
  • Reliable tool-use
  • Long-context tasks, handles 200K tokens vs 128K for GLM-4.5.
Pick GLM-4.5 if

GLM-4.5 fits when…

  • MIT license
  • Strong Chinese
  • Multimodal
  • Self-hosting and on-prem requirements, open weights (MIT).
Don't want either?

Consider Claude Opus 4.7

Anthropic's mid-2026 flagship, ahead on SWE-bench, agent reliability, and writing quality.

See Claude Opus 4.7 specsClaude Sonnet 4.6 vs Claude Opus 4.7GLM-4.5 vs Claude Opus 4.7

Frequently asked

  • Is Claude Sonnet 4.6 or GLM-4.5 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?
    Claude Sonnet 4.6 accepts 200K tokens vs 128K for GLM-4.5.
  • Is Claude Sonnet 4.6 or GLM-4.5 better for coding?
    Both Claude Sonnet 4.6 and GLM-4.5 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?
    GLM-4.5 ships open weights (MIT). Claude Sonnet 4.6 is API-only.
  • When were Claude Sonnet 4.6 and GLM-4.5 released?
    Claude Sonnet 4.6 was released by Anthropic on 2026-01-20. GLM-4.5 was released by Other on 2025-07-28.
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