Compare / head-to-head
Claude Opus 4.8vsGLM-5.3-Flash
Claude Opus 4.8 leads 4 of 6 shared benchmarks. GLM-5.3-Flash is 46.2x cheaper per token. Both offer a 1M-token context window.
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
4 – 2
Claude Opus 4.8 leads
Cheaper per token
GLM-5.3-Flash
46.2x cheaper, input + output
Larger context
Tie
both 1M tokens
Provider uptime (30d)
100% · —
Anthropic · Z.ai
Claude Opus 4.8
Anthropic · released 2026-05-28
textvision
GLM-5.3-Flash
Z.ai · released 2026-09-16
textvision
Quality
Benchmark matrix
6 shared · 10 only Claude Opus 4.8 · 13 only GLM-5.3-Flash| Benchmark | Claude Opus 4.8 | GLM-5.3-Flash | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 6 | ||||
| GPQA Diamond | 93.6% ↗ | 90.2% ↗epoch | +3.4 pt | Claude Opus 4.8 |
| LMArena Elo | 1452.7 ↗ | 1471.9 ↗ | -19.2 | GLM-5.3-Flash |
| FrontierMath Tier 4 v2 (Epoch AI run) | 56.1% ↗epoch | 17.1% ↗epoch | +39 pt | Claude Opus 4.8 |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 80% ↗epoch | 55.8% ↗epoch | +24.2 pt | Claude Opus 4.8 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 98.3% ↗epoch | 93.9% ↗epoch | +4.4 pt | Claude Opus 4.8 |
| Terminal-Bench 2.1 | 74.6% ↗ | 84.3% ↗ | -9.7 pt | GLM-5.3-Flash |
| Only Claude Opus 4.8 reports · 10 | ||||
| SWE-bench Verified | 88.6% ↗ | not reported | — | — |
| AIME 2026 | 100% ↗matharena ⚠ | not reported | — | — |
| Humanity's Last Exam (no tools) | 49.8% ↗ | not reported | — | — |
| BrowseComp | 84.3% ↗ | not reported | — | — |
| Humanity's Last Exam (with tools) | 57.9% ↗ | not reported | — | — |
| OSWorld-Verified | 83.4% ↗ | not reported | — | — |
| SimpleQA Verified | 53% ↗epoch | not reported | — | — |
| SWE-bench Multilingual | 84.4% ↗ | not reported | — | — |
| SWE-bench Multimodal | 38.4% ↗ | not reported | — | — |
| SWE-Bench Pro | 69.2% ↗ | not reported | — | — |
| Only GLM-5.3-Flash reports · 13 | ||||
| Agents' Last Exam (ALE-CLI) | not reported | 26.3% ↗ | — | — |
| AutomationBench v1.0.6 | not reported | 48.8% ↗ | — | — |
| BabyVision | not reported | 53.4% ↗ | — | — |
| Chartography (with tools) | not reported | 78% ↗ | — | — |
| CharXiv Reasoning (with tools) | not reported | 89.4% ↗ | — | — |
| DeepSWE v1.1 | not reported | 63.4% ↗ | — | — |
| GDPval-AA v2 | not reported | 1773 ↗ | — | — |
| HLE (with tools) | not reported | 55.3% ↗ | — | — |
| MMVU | not reported | 80.5% ↗ | — | — |
| MVBench | not reported | 77.8% ↗ | — | — |
| NL2Repo | not reported | 56.3% ↗ | — | — |
| OfficeQA Pro | not reported | 62.4% ↗ | — | — |
| Toolathlon Verified | not reported | 78.4% ↗ | — | — |
Scores tagged "epoch" or "matharena" are independent runs, used only where the lab has not published its own; ⚠ marks rows MathArena flags as released after the competition. Higher is better on every row. Δ is Claude Opus 4.8 minus GLM-5.3-Flash in the benchmark's own unit. "Not reported" means the lab has not published that figure; it is not a zero. ↗ opens the source.
Specs & pricing
Side by side
Official pricing pages and model cards| Spec | Claude Opus 4.8 | GLM-5.3-Flash | Edge |
|---|---|---|---|
| Context window | 1M tokens | 1M tokens | Tie |
| Max output | 128K tokens | 131K tokens | GLM-5.3-Flash |
| Input price / 1M | $5 ↗ | $0.15 ↗ | GLM-5.3-Flash |
| Output price / 1M | $25 ↗ | $0.5 ↗ | GLM-5.3-Flash |
| Cached input / 1M | $0.5 ↗ | $0.03 ↗ | GLM-5.3-Flash |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $30 | $0.65 | GLM-5.3-Flash |
| Modalities | text · vision | text · vision | Tie |
| Released | 2026-05-28 | 2026-09-16 | — |
| Cited benchmark scores | 17 | 19 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
Claude Opus 4.8 vs …
Models sharing the most benchmarksMore matchups
GLM-5.3-Flash vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run Claude Opus 4.8 and GLM-5.3-Flash on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.