Claude Opus 4.6 vs GLM-5.3-Flash
| Spec | Claude Opus 4.6 | GLM-5.3-Flash |
|---|---|---|
| Respan Index | 45.1 (#46) | 45.2 (#45) |
| Blended price per 1M | $10 | $0.043 |
| Context window | 1M | 1M |
| Input / output per 1M | $5 / $25 | $0.027 / $0.092 |
| Max output | 128K | 131K |
| Input | text, vision | text, vision |
| Released | 2026-02-05 | 2026-08-26 |
Respan Index by category
Each category is scored 0 to 100, and how far ahead the winner is. Leads under a point are close to even.
| Category | Claude Opus 4.6 | GLM-5.3-Flash |
|---|---|---|
| Coding | 29.5 Claude Opus 4.6 | 39.9 GLM-5.3-Flash |
| Agents | 55.9 Claude Opus 4.6 | 61.6 GLM-5.3-Flash |
| Reasoning | 43.2 Claude Opus 4.6 | 32.8 GLM-5.3-Flash |
| Knowledge & language | 47.5 Claude Opus 4.6 | 32.0 GLM-5.3-Flash |
| Human preference | 54.9 Claude Opus 4.6 | 56.1 GLM-5.3-Flash |
Benchmarks both report
Claude Opus 4.6 leads on 11 of the 17 benchmarks both report. Higher is better. Each score links to where it was published.
| Benchmark | Claude Opus 4.6 | GLM-5.3-Flash |
|---|---|---|
| Chess Puzzles (Epoch AI) | 21% | 21% |
| LMArena Elo | 1503 | 1477 |
| LMArena WebDev (LMArena) | 1546 | 1607 |
| LMArena Vision (LMArena) | 1299 | 1271 |
| APEX-Agents (Mercor) | 46.3% | 52.8% |
| FrontierMath Tier 4 v2 (Epoch AI) | 26.8% | 17.1% |
| FrontierMath Tiers 1-3 v2 (Epoch AI) | 66% | 55.8% |
| GPQA Diamond | 91.3% | 90.2% |
| LiveBench Agentic Coding (LiveBench) | 49% | 56.8% |
| LiveBench Coding (LiveBench) | 78.2% | 79% |
| LiveBench Data Analysis (LiveBench) | 69.9% | 76.4% |
| LiveBench Instruction Following (LiveBench) | 63.3% | 52.8% |
| LiveBench Language (LiveBench) | 83.3% | 77.3% |
| LiveBench Mathematics (LiveBench) | 89.3% | 81.2% |
| LiveBench Reasoning (LiveBench) | 88.7% | 77.6% |
| Mystery Game Puzzles (Epoch AI) | 25% | 8% |
| OTIS Mock AIME 2024-2025 (Epoch AI) | 94.4% | 93.9% |
FAQ
Is Claude Opus 4.6 better than GLM-5.3-Flash?
GLM-5.3-Flash scores 45.2 on the Respan Index (#45), ahead of Claude Opus 4.6 at 45.1 (#46). Claude Opus 4.6 leads on 11 of the 17 benchmarks both report.
Which is cheaper, Claude Opus 4.6 or GLM-5.3-Flash?
Claude Opus 4.6 lists at $5 input and $25 output per 1M tokens; GLM-5.3-Flash at $0.027 and $0.092. GLM-5.3-Flash is 231x cheaper per token at list price.
Which has the larger context window?
Both accept 1M tokens of context.