Claude Instant 1.2vsGLM-4.5
Claude Instant 1.2 | GLM-4.5 | |
|---|---|---|
| Specifications | ||
Parameters | — | 355B |
Context window | 100k | 128k |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | — | 8% |
Coding SWE-Bench VerifiedReal coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | — | 64.2% |
Function synthesis HumanEval164 small Python problems: the AI is given a function's description and has to write the working function. This was the coding benchmark of the GPT-3.5 and GPT-4 era, before the field moved to fixing real bugs in real repositories. Higher is better. | 58.7% | — |
Science GPQA DiamondGraduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | — | 79.1% |
Grade-school math GSM8KGrade-school maths word problems that take a few steps of arithmetic to work through. It separated the models of 2022 and 2023 sharply, then saturated. One caveat on the historical numbers: OpenAI included part of the GSM8K training set in GPT-4's pre-training mix, so GPT-4's score is not a clean few-shot result. Higher is better. | 86.7% | — |
| Overview | ||
| Company | Anthropic | Z.ai |
| Release date | Aug 9 2023 | Jul 28 2025 |
| Access | Proprietary | Open Weight |
Which is better: Claude Instant 1.2 or GLM-4.5?
Claude Instant 1.2 and GLM-4.5 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Claude Instant 1.2 shipped 719 days before GLM-4.5, so benchmark comparisons should account for the intervening progress.
Context windows are 100k (Claude Instant 1.2) vs 128k (GLM-4.5). Claude Instant 1.2 is proprietary, while GLM-4.5 is open weight.
Direct benchmark comparisons are unavailable — Claude Instant 1.2 and GLM-4.5 don't publish scores on any of the same benchmarks.
Frequently asked questions
Claude Instant 1.2 was released by Anthropic on Aug 9 2023.
GLM-4.5 was released by Z.ai on Jul 28 2025.
Claude Instant 1.2 has a 100k context window; GLM-4.5 has 128k.
Claude Instant 1.2 is a proprietary model released by Anthropic. GLM-4.5 is an open weight model released by Z.ai.