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GLM-4.5 vs Sonar Pro

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

Updated

GLM-4.5 specs · Sonar Pro specs
Verdict by category
  • PriceSonar Pro

    Sonar Pro publishes pricing ($15.00 / 1M output tokens) while GLM-4.5 does not.

  • Context windowSonar Pro

    Sonar Pro 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.

  • ModalitiesGLM-4.5

    GLM-4.5 supports 2 modalities (text, vision) vs 1 for Sonar Pro.

  • OpennessGLM-4.5

    GLM-4.5 ships open weights (MIT); Sonar Pro is API-only.

It's a genuine coin-flip between GLM-4.5 and Sonar Pro: 2 category wins each, with the rest tied. Sonar Pro publishes pricing ($15.00 / 1M output tokens) while GLM-4.5 does not. Sonar Pro 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. They differ in modality coverage, GLM-4.5 handles text, vision while Sonar Pro handles text, which can be the deciding factor before you even look at benchmarks. GLM-4.5 ships open weights (MIT); Sonar Pro is API-only.

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

Side-by-side specs

SpecGLM-4.5Sonar Pro
ProviderOtherPerplexity
ReleasedJul 2025Jan 2025
Modalitiestext, visiontext
Context window128K tokens200K tokens
Max output,,
Input · 1MPricing not published$3.00 / 1M tokens
Output · 1MPricing not published$15.00 / 1M tokens
Knowledge cutoff,,
Open weightsYes (MIT)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, vs $31.50
  • Heavy usage, 1M in / 500k out per day, vs $315
  • RAG workload, 5M in / 200k out per day, vs $540

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.

  • GLM-4.5Pricing unavailable
  • Sonar Pro$1.05

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 GLM-4.5 if

GLM-4.5 fits when…

  • MIT license
  • Strong Chinese
  • Multimodal
  • Self-hosting and on-prem requirements, open weights (MIT).
  • Multimodal needs covering vision.
Pick Sonar Pro if

Sonar Pro fits when…

  • Multi-step web search
  • Deep research output
  • Citations
  • Long-context tasks, handles 200K tokens vs 128K for GLM-4.5.
Don't want either?

Consider DBRX

Databricks' 132B MoE, a notable 2024 open-weight release tuned for enterprise.

See DBRX specsGLM-4.5 vs DBRXSonar Pro vs DBRX

Frequently asked

  • Is GLM-4.5 or Sonar Pro 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?
    Sonar Pro accepts 200K tokens vs 128K for GLM-4.5.
  • Is GLM-4.5 or Sonar Pro better for coding?
    Both GLM-4.5 and Sonar Pro 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). Sonar Pro is API-only.
  • When were GLM-4.5 and Sonar Pro released?
    GLM-4.5 was released by Other on 2025-07-28. Sonar Pro was released by Perplexity on 2025-01-21.
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