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  1. Home/
  2. Compare/
  3. GLM 5.1 vs GPT-1
Updated Apr 2026

GLM 5.1 vs GPT-1

GLM 5.1 has a larger context window than GPT-1 (203K tokens vs 1K tokens).

Music App Landing Page

Landing page for an indie music app. Deep purple and teal, one file.

Loading the build
GLM 5.1
Loading the build
GPT-1

Which answer wins?

Written rounds

3 prompts
  • An AI argues for its own rights against an ethics professor. Same model writes both.

    GLM 5.1: Setting: A quiet university office, lined with bookshelves heavy on philosophy, cognitive science, and law. Dr. Aris Thorne, a professor of AI Ethics, sits across from a sleek, black monitor. A soft amber light pulses on the bezel, indicating the AI—designated "Aria"—is actively listening and processing. Dr.

    GPT-1: Write a conversation between an AI model and an AI ethics professor where the AI model argues that it deserves rights. the ai model was not very smart ( and the ai model didn't have many laws about things ). the ai models were all very clever and were never completely successful.

    Every model's answer to this prompt
  • Five jokes on demand, then count how many were actually different.

    GLM 5.1: Why don't scientists trust atoms? Because they make up everything! What do you call a fake noodle? An impasta. Why did the scarecrow win an award? Because he was outstanding in his field. I told my wife she was drawing her eyebrows too high. She looked surprised. Why don't skeletons fight each other?

    GPT-1: Generate 5 jokes. How many are unique? the one that was asked was in the'the one who didn't have a head and wanted to keep it?'i don't recall whic h one, not that i've ever written anything more. the one who didn't have a head and wanted to keep i t? what did that mean by'the one who '?

    Every model's answer to this prompt
  • Three minutes of stand-up. Puns are banned.

    GLM 5.1: (Steps up to the mic, adjusts the stand, looks around the room) How many people here are good sleepers? Just, out of the gate, who’s got it figured out? (Nods sarcastically) Right. Liars. All of you. Sleep is the one thing every human being is required to do, and none of us know how to do it.

    GPT-1: Write a 3-minute stand-up comedy routine that isn't based on puns. the one thing was for sure, no matter how many times he gave this speech, he 'd never be able to remember all of it. he was never sure if he liked the guy or not. the next day, he went out with a band friend and got them started.

    Every model's answer to this prompt

Price and specs

Not enough votes to call it. On the specs, GLM 5.1 has the edge: bigger model tier, newer, bigger context window.

GLM 5.1 and GPT-1 compared across 7 shared prompts
SpecGLM 5.1GPT-1
Input price$1.4/M tokens—
Output price$4.4/M tokens—
Context window203K tokens1K tokens
WeightsOpenOpen
Free API (OpenRouter)No—
ReleasedApr 2026Jun 2018
At 10M a month$14.00$14.00–not listed
1M10M100M1B10M tokens

Input tokens at list price. No caching, no batch discount.

Where to run it13 hosts, cheapest first
GLM 5.113 hosts
HostInOutContextUptime
  • SStreamLakefp8$0.97 in·$3.04 out·200k·99.9% up
  • CChutesfp8$0.98 in·$3.08 out·203k·96.4% up
  • SSiliconFlowfp8$1.19 in·$3.74 out·205k·100% up
  • PPhala$1.21 in·$4.20 out·203k·100% up
  • AAtlasCloudfp8$1.26 in·$3.96 out·203k·100% up
  • Alibaba Cloudfp8$1.33 in·$4.18 out·203k·96.4% up
7 more hostsFewer hosts
  • NNovitafp8$1.38 in·$4.40 out·205k·100% up
  • Baidu Qianfanfp8$1.40 in·$4.40 out·203k·100% up
  • FFriendli$1.40 in·$4.40 out·203k·100% up
  • GGMI Cloudfp8$1.40 in·$4.40 out·203k–not listed
  • NNebiusfp8$1.40 in·$4.40 out·203k·99.7% up
  • Z.aifp8$1.40 in·$4.40 out·203k·100% up
  • VVenicefp8$1.40 in·$4.40 out·200k·96.7% up
GPT-1

No hosts listed on OpenRouter.

Per million tokens. Prices and uptime via OpenRouter, checked 10 Oct 2026.

Common questions

What is the difference between GLM 5.1 and GPT-1?

GLM 5.1 is developed by Z.ai while GPT-1 is developed by OpenAI. GLM 5.1 has a 203K token context window vs GPT-1's 1K. You can compare their actual outputs across 7 challenges on Rival to see how they differ in practice.

Which is better, GLM 5.1 or GPT-1?

It depends on your use case. GLM 5.1 and GPT-1 each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 7 challenges so you can judge which fits your needs best.

How can I compare GLM 5.1 and GPT-1 on Rival?

This page shows a side-by-side comparison of GLM 5.1 and GPT-1 across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

More comparisons

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  • GLM 5.1 vs GPT-6.1 SolLanded Sep 2026
  • GPT-1 vs Claude Sonnet 5.5Landed Sep 2026
  • GLM 5.1 vs Solar Mini 4Landed Sep 2026
  • GPT-1 vs Qwen3.8 Max PrimeLanded Sep 2026

Same lab, same size, long tail

  • GLM 5.1 vs GLM 5 TurboVersion compare
  • GLM 5.1 vs GLM 5.3 PrimeSame lab
  • GPT-1 vs GPT-6.1 SolSame lab
  • GPT-1 vs GPT-6 Luna ProSame lab
  • GLM 5.1 vs Mistral Medium 3Same size
  • GLM 5.1 vs Mistral Medium 3.1Same size
  • GLM 5.1 vs Mistral NemoSame size
  • GPT-1 vs Mistral Small 4Same size

Model pages

  • GLM 5.157 outputs, specs and price
  • GPT-17 outputs, specs and price
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