Compare / head-to-head
Claude Sonnet 4.5vsGLM-5.3-Flash
GLM-5.3-Flash leads 4 of 4 shared benchmarks. GLM-5.3-Flash is 27.7x cheaper per token. GLM-5.3-Flash has the larger context window (1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
0 – 4
GLM-5.3-Flash leads
Cheaper per token
GLM-5.3-Flash
27.7x cheaper, input + output
Larger context
GLM-5.3-Flash
1M tokens
Provider uptime (30d)
100% · —
Anthropic · Z.ai
Claude Sonnet 4.5
Anthropic · released 2025-09-29
textvision
GLM-5.3-Flash
Z.ai · released 2026-09-16
textvision
Quality
Benchmark matrix
4 shared · 16 only Claude Sonnet 4.5 · 15 only GLM-5.3-Flash| Benchmark | Claude Sonnet 4.5 | GLM-5.3-Flash | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 4 | ||||
| GPQA Diamond | 83.4% ↗ | 90.2% ↗epoch | -6.8 pt | GLM-5.3-Flash |
| FrontierMath Tier 4 v2 (Epoch AI run) | 2.4% ↗epoch | 17.1% ↗epoch | -14.7 pt | GLM-5.3-Flash |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 23.9% ↗epoch | 55.8% ↗epoch | -31.9 pt | GLM-5.3-Flash |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 77.8% ↗epoch | 93.9% ↗epoch | -16.1 pt | GLM-5.3-Flash |
| Only Claude Sonnet 4.5 reports · 16 | ||||
| SWE-bench Verified | 77.2% ↗ | not reported | — | — |
| AIME 2025 | 84.2% ↗matharena ⚠ | not reported | — | — |
| Humanity's Last Exam (no tools) | 17.7% ↗ | not reported | — | — |
| ARC-AGI-2 (Verified) | 13.6% ↗ | not reported | — | — |
| GDPval-AA | 1276 ↗ | not reported | — | — |
| Humanity's Last Exam (with tools) | 33.6% ↗ | not reported | — | — |
| MCP Atlas | 43.8% ↗ | not reported | — | — |
| MMMLU | 89.5% ↗ | not reported | — | — |
| MMMU-Pro (no tools) | 63.4% ↗ | not reported | — | — |
| MMMU-Pro (with tools) | 68.9% ↗ | not reported | — | — |
| OSWorld-Verified | 61.4% ↗ | not reported | — | — |
| SimpleQA Verified | 30.7% ↗epoch | not reported | — | — |
| SWE-bench Verified (Epoch AI run) | 71.3% ↗epoch | not reported | — | — |
| Tau2-bench Retail | 86.2% ↗ | not reported | — | — |
| Tau2-bench Telecom | 98% ↗ | not reported | — | — |
| Terminal-Bench 2.0 | 51% ↗ | not reported | — | — |
| Only GLM-5.3-Flash reports · 15 | ||||
| LMArena Elo | not reported | 1471.9 ↗ | — | — |
| 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% ↗ | — | — |
| Terminal-Bench 2.1 | not reported | 84.3% ↗ | — | — |
| 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 Sonnet 4.5 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 Sonnet 4.5 | GLM-5.3-Flash | Edge |
|---|---|---|---|
| Context window | 200K tokens | 1M tokens | GLM-5.3-Flash |
| Max output | 64K tokens | 131K tokens | GLM-5.3-Flash |
| Input price / 1M | $3 ↗ | $0.15 ↗ | GLM-5.3-Flash |
| Output price / 1M | $15 ↗ | $0.5 ↗ | GLM-5.3-Flash |
| Cached input / 1M | $0.3 ↗ | $0.03 ↗ | GLM-5.3-Flash |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $18 | $0.65 | GLM-5.3-Flash |
| Modalities | text · vision | text · vision | Tie |
| Released | 2025-09-29 | 2026-09-16 | — |
| Cited benchmark scores | 21 | 19 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
Claude Sonnet 4.5 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 Sonnet 4.5 and GLM-5.3-Flash on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.