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Head-to-head comparison

o3 vs GLM 5 Turbo

o3 (OpenAI) and GLM 5 Turbo (Z.ai) compared on the ModelCap Index, API price, context window, provider availability, weight access and every public benchmark board they share. Figures are the same ones shown on the live rankings; nothing here is a hidden score.

Snapshot as of 17 August 2026

As of 17 August 2026, o3 holds the stronger ModelCap Index position (#38 vs #39); GLM 5 Turbo is 2× cheaper per output token ($4.00/1M vs $8.00/1M); and GLM 5 Turbo offers the longer context window (203K vs 200K tokens).

Which should you choose?

Choose o3 if…

  • you want the stronger overall ModelCap Index position — #38 against #39 (55.1 vs 55.0 points).

Choose GLM 5 Turbo if…

  • API cost matters — $4.00/1M output tokens against $8.00/1M, about 2× cheaper.
  • your workload is prompt-heavy — input tokens cost $1.20/1M against $2.00/1M.
  • you need the longer context window — 203K tokens against 200K.
  • Artificial Analysis Intelligence Index is your yardstick — 39.1 against 31.1.
  • you want the more recently listed model — GLM 5 Turbo was listed 15 March 2026, o3 16 April 2025.

o3 vs GLM 5 Turbo: specs, pricing and context

Specification comparison of o3 and GLM 5 Turbo
Fieldo3OpenAIGLM 5 TurboZ.ai
ModelCap Index position#38#39
Index score55.155.0
EvidenceMeasuredMeasured
Input price / 1M tokens$2.00$1.20
Output price / 1M tokens$8.00$4.00
Context window200K tokens203K tokens
Max output tokens100K131K
API providers listed11
Weight accessAPI onlyAPI only
Input modalitiesImage, Text, FileText
First listed16 April 202515 March 2026
PublisherOpenAIZ.ai

Evidence: 4 public benchmark observations across 4 boards · 1 public benchmark observation across 1 board. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: o3 vs GLM 5 Turbo

Public benchmark boards where o3 or GLM 5 Turbo has a published result
Boardo3GLM 5 TurboLeads
Arena codingArena (LMArena)14601453–1466—Only one result
ARC-AGI-2ARC Prize Foundation6.5%High—Only one result
Artificial Analysis Intelligence IndexArtificial Analysis31.1intelligence-index39.1intelligence-indexGLM 5 Turbo

Scores are the sources' own published figures for each model's best evaluated configuration; ModelCap never re-runs a benchmark.

Want a different pairing? Open the interactive comparison tool to swap either model for any current ranked language model.

o3 vs GLM 5 Turbo: common questions

Is o3 better than GLM 5 Turbo?

o3 ranks higher on the ModelCap Index as of 17 August 2026: #38 against #39. That is a capability ranking built from public benchmark evidence with published uncertainty; whether it is "better" for you also depends on price, context and where you can run it.

Is o3 cheaper than GLM 5 Turbo?

GLM 5 Turbo is cheaper on output tokens: $4.00/1M against $8.00/1M. Input tokens are $2.00/1M for o3 and $1.20/1M for GLM 5 Turbo. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens.

Which has the bigger context window, o3 or GLM 5 Turbo?

GLM 5 Turbo has the larger context window: 203K tokens against 200K.

Which is better for coding, o3 or GLM 5 Turbo?

The two models do not share a coding benchmark board on ModelCap yet, so no head-to-head coding score is published; the ModelCap Index position is the closest overall signal.

Are o3 and GLM 5 Turbo open-weight models?

o3: API only. GLM 5 Turbo: API only. Open weights mean the checkpoint can be downloaded and self-hosted under its licence; API-only models are available solely through hosted endpoints.

Where can I run o3 and GLM 5 Turbo?

ModelCap currently lists 1 API provider for o3 and 1 for GLM 5 Turbo, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this o3 vs GLM 5 Turbo comparison?

Every figure comes from the sealed ModelCap dataset published 17 August 2026; the page re-renders within a minute of each data refresh, and the ModelCap Index positions are the same ones shown on the live rankings.

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