GLM 5.2 Open vs 
Claude Opus 4.8 Paid
GLM 5.2 vs Claude Opus 4.8 compared — price per token, context window, multimodality, openness and which to choose. Can the open-source model replace the paid one? Full 2026 breakdown.
Claude Opus 4.8 — full profile ›
Prices & specs refreshed from live data · OpenSourceAI.tech
Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.
GLM 5.2 vs Claude Opus 4.8 specs
| Spec | GLM 5.2 | Claude Opus 4.8 |
|---|---|---|
| Maker | Z.AI | Anthropic |
| Type | Open-weight | Proprietary |
| Context window | 1M tokens | 1M tokens |
| Input price | $0.78/M · free self-host | $5/M |
| Output price | $2.44/M · free self-host | $25/M |
| Vision / multimodal | No | Yes |
| Tool / function calling | Yes | Yes |
| Self-hostable | Yes | No (API only) |
| License | MIT | Proprietary |
Feature comparison
| Capability | GLM 5.2 | Claude Opus 4.8 |
|---|---|---|
| Open weights (downloadable) | ✓ | ✗ |
| Self-hostable | ✓ | ✗ |
| Runs fully offline | ✓ | ✗ |
| Vision / multimodal | ✗ | ✓ |
| Tool / function calling | ✓ | ✓ |
| 1M+ context window | ✓ | ✓ |
Benchmarks: GLM 5.2 vs Claude Opus 4.8
Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).
Benchmark data by Artificial Analysis.
How GLM 5.2 and Claude Opus 4.8 score
| Criterion | GLM 5.2 | Claude Opus 4.8 |
|---|---|---|
| Cost-efficiency | 4.5 | 3.0 |
| Context window | 5.0 | 5.0 |
| Openness | 5.0 | 1.5 |
| Self-hosting | 5.0 | 1.0 |
| Multimodality | 3.5 | 5.0 |
Scores come from live data — output price (cost), context length, open vs closed weights (openness & self-hosting) and vision/tool support (multimodality). Raw task quality isn't scored here; it depends on your benchmark — see the verdict.
What each model is
GLM 5.2 Open
GLM 5.2 is a large-scale reasoning model from Z.ai. It supports text input and output with a 1M-token context window, and is suited for long-horizon agent workflows, project-level software engineering,...
Claude Opus 4.8 Paid
Claude Opus 4.8 is Anthropic's most capable generally available model in the Opus family. It supports text, image, and file inputs with text output, with reasoning support and a 1M-token...
Other models in these families
These variants are tracked but not compared here — one page per family keeps the comparison readable.
Frequently asked questions
Is GLM 5.2 as good as Claude Opus 4.8?
GLM 5.2 is open-weight and competitive on many tasks, but Claude Opus 4.8 may still lead on the hardest reasoning and agentic work. The gap keeps narrowing — benchmark both on your actual use case before deciding.
Can I run GLM 5.2 locally?
Yes. GLM 5.2 has open weights, so you can self-host it on your own GPUs or run it via a low-cost API. Claude Opus 4.8 is API-only and cannot be self-hosted.
How much cheaper is GLM 5.2?
GLM 5.2 costs $2.44/M output vs $25/M for Claude Opus 4.8 — roughly 10x cheaper via API, and free if you self-host.
GLM 5.2 vs Claude Opus 4.8 — which should I pick in 2026?
Choose GLM 5.2 if you want to self-host, keep your data private and skip per-token fees — it's open-weight and runs on your own hardware. Choose Claude Opus 4.8 if you want frontier capability through a managed API with zero infrastructure to run.
People also compare
Explore more open-source AI
Browse the full open-source model leaderboard, thousands of tools and live benchmarks — all in one place.
Open the leaderboard →