GLM 5.3 Flash vs GPT-6 Astra
GLM 5.3 Flash 
GPT-6 Astra Verdict
- GPT-6 Astra (max) leads on quality: 70.9 vs 61.1.
- GLM 5.3 Flash is stronger in human preference, long context, multimodal.
- GPT-6 Astra (max) is stronger in agents & tools, coding, composite, knowledge, reasoning, maths.
- GLM 5.3 Flash is 168× cheaper ($0.119 vs $20.00 per 1M blended).
- GLM 5.3 Flash streams 3.3× faster (90 vs 27 tokens per second).
| Metric | GLM 5.3 Flash | GPT-6 Astra (max) |
|---|---|---|
| BenchLeader Index | 61.1 | 70.9 |
| Agents & tools score | 52.1 | 68.2 |
| Coding score | 64.3 | 78.6 |
| Composite score | 61.7 | 72.9 |
| Human preference score | 67.6 | – |
| Knowledge score | 67.7 | 80.0 |
| Long context score | 66.6 | – |
| Multimodal score | 65.5 | – |
| Reasoning score | 67.5 | 73.6 |
| Maths score | – | 77.2 |
| Blended price $/M | $0.119 | $20.00 |
| Output speed | 90 tok/s | 27 tok/s |
| Time to first answer | 24.9 s | 337.3 s |
| Context window | 1M | 1.1M |
| GPQA Diamond | – | 95.8% |
| FrontierMath Tiers 1–3 | – | 93.7% |
| FrontierMath Tier 4 | – | 97.6% |
| OTIS Mock AIME | – | 100.0% |
| SimpleQA Verified | – | 75.6% |
| Terminal-Bench | – | 58.2% |
| SciCode | 46.1% | 56.5% |
| FrontierCode | – | 53.3% |
| Epoch Capabilities Index | 151.4 | – |
| LMArena Text | 1474 | – |
| LMArena Hard Prompts | 1496 | – |
| LMArena Coding | 1534 | – |
| LMArena WebDev | 1605 | 1796 |
| LMArena Vision | 1296 | – |
| LMArena Agent | 2 | 12.5 |
| LiveBench | 71.6% | 82.2% |
| LiveBench Reasoning | 77.6% | 92.7% |
| LiveBench Coding | 79.0% | 80.4% |
| LiveBench Agentic Coding | 56.8% | 57.3% |
| LiveBench Mathematics | 81.2% | 96.8% |
| LiveBench Data Analysis | 76.4% | 83.0% |
| LiveBench Language | 77.3% | 89.4% |
| AA Intelligence Index | 41.9 | – |
| AA-LCR | 80.0% | – |
| AA-Omniscience | 7.5 | – |
| GPQA Diamond (AA) | 91.2% | – |
| Humanity's Last Exam (AA) | 39.9% | – |
| SciCode (AA) | 51.6% | – |
| Terminal-Bench 2.1 (Vals) | – | 87.3% |
| Vals Index | – | 66.6 |
| ARC-AGI-1 | – | 97.5% |
| ARC-AGI-2 | – | 95.0% |
| ARC-AGI-3 | – | 98.6% |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
GLM 5.3 Flash vs GPT-6 Astra: questions
- Is GLM 5.3 Flash better than GPT-6 Astra?
- GPT-6 Astra (max) leads on quality: 70.9 vs 61.1. The BenchLeader Index combines every independent quality benchmark; GPT-6 Astra (max) is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is GLM 5.3 Flash better than GPT-6 Astra for coding?
- GPT-6 Astra scores higher in coding (79 vs 64 on the category index, where 50 is average).
- Is GLM 5.3 Flash better than GPT-6 Astra for agentic tasks?
- GPT-6 Astra scores higher in agentic tasks (68 vs 52 on the category index, where 50 is average).
- Which is cheaper, GLM 5.3 Flash or GPT-6 Astra?
- GLM 5.3 Flash is cheaper: $0.119 against $20.00 per million tokens, blended at three input tokens per output token.
- Which is faster, GLM 5.3 Flash or GPT-6 Astra?
- GLM 5.3 Flash streams faster: 90 against 27 output tokens per second.
- Which has the larger context window?
- GPT-6 Astra accepts more context: 1.1M against 1M tokens.