Compare / head-to-head
Claude Sonnet 5vsGLM-5.3-Flash
Claude Sonnet 5 leads 4 of 4 shared benchmarks. GLM-5.3-Flash is 18.5x 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 – 0
Claude Sonnet 5 leads
Cheaper per token
GLM-5.3-Flash
18.5x cheaper, input + output
Larger context
Tie
both 1M tokens
Provider uptime (30d)
100% · —
Anthropic · Z.ai
Claude Sonnet 5
Anthropic · released 2026-06-30
textvision
GLM-5.3-Flash
Z.ai · released 2026-09-16
textvision
Quality
Benchmark matrix
4 shared · 4 only Claude Sonnet 5 · 15 only GLM-5.3-Flash| Benchmark | Claude Sonnet 5 | GLM-5.3-Flash | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 4 | ||||
| GPQA Diamond | 90.5% ↗epoch | 90.2% ↗epoch | +0.3 pt | Claude Sonnet 5 |
| FrontierMath Tier 4 v2 (Epoch AI run) | 29.3% ↗epoch | 17.1% ↗epoch | +12.2 pt | Claude Sonnet 5 |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 65.6% ↗epoch | 55.8% ↗epoch | +9.8 pt | Claude Sonnet 5 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 94.7% ↗epoch | 93.9% ↗epoch | +0.8 pt | Claude Sonnet 5 |
| Only Claude Sonnet 5 reports · 4 | ||||
| SWE-bench Verified | 85.2% ↗ | not reported | — | — |
| Humanity's Last Exam (no tools) | 43.2% ↗ | not reported | — | — |
| Humanity's Last Exam (with tools) | 57.4% ↗ | not reported | — | — |
| SimpleQA Verified | 33.7% ↗epoch | 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 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 5 | 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 | $2 ↗ | $0.15 ↗ | GLM-5.3-Flash |
| Output price / 1M | $10 ↗ | $0.5 ↗ | GLM-5.3-Flash |
| Cached input / 1M | $0.2 ↗ | $0.03 ↗ | GLM-5.3-Flash |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $12 | $0.65 | GLM-5.3-Flash |
| Modalities | text · vision | text · vision | Tie |
| Released | 2026-06-30 | 2026-09-16 | — |
| Cited benchmark scores | 8 | 19 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
Claude Sonnet 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 5 and GLM-5.3-Flash on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.