GLM-5.3-Flash vs GPT-6 Astra
GLM-5.3-Flash (Z.ai (Zhipu AI)) and GPT-6 Astra (OpenAI) compared on benchmarks, pricing, context window, and use-case rankings.
- GPT-6 Astra leads on overall intelligence (ECI 169 vs 153).
- GLM-5.3-Flash is cheaper on input tokens: $0.05 vs $10.00 per 1M.
- GPT-6 Astra has a larger context window (1.1M vs 1M tokens).
- GPT-6 Astra ranks higher for coding (92nd vs 74th percentile).
| Attribute | GLM-5.3-Flash | GPT-6 Astra |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 153 | 169 |
| Coding | 74 | 92 |
| Math | 49 | 87 |
| Reasoning & Knowledge | 52 | 98 |
| Agentic & Tools | 68 | 86 |
| Specifications | ||
| Developer | Z.ai (Zhipu AI) | OpenAI |
| Family | — | GPT |
| Released | Aug 20, 2026 | Sep 3, 2026 |
| Parameters | 320B | — |
| Availability | Open weights (unrestricted) | API access |
| Context window | 1M | 1.1M |
| Price — $/M input | $0.05 | $10.00 |
| Price — $/M output | $0.07 | $50.00 |
| Inputs | text, image, video | file, image, text |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 94% | 100% |
| APEX | 53% | 65% |
| ARC-AGI | 91% | 99% |
| ARC-AGI-2 | 66% | 95% |
| GPQA Diamond | 90% | 96% |
| Humanity's Last Exam | 40% | 55% |
| SciCode | 52% | 56% |
| SimpleQA Verified | 32% | 76% |
| WebDev Arena | 1607 | 1800 |
| GSO (code optimization) | — | 79% |
| WeirdML | — | 94% |
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
Frequently asked questions
Is GLM-5.3-Flash better than GPT-6 Astra?
On Epoch AI's Capabilities Index, GPT-6 Astra scores higher (169) than GLM-5.3-Flash (153). The right pick depends on your task, so compare their coding, math, and reasoning scores in the table above.
Which is cheaper, GLM-5.3-Flash or GPT-6 Astra?
GLM-5.3-Flash is cheaper on input tokens at $0.05 per million, versus $10.00 (representative OpenRouter pricing).
Which has a larger context window, GLM-5.3-Flash or GPT-6 Astra?
GPT-6 Astra supports up to 1.1M tokens, compared with 1M for the other.
Which is better for coding, GLM-5.3-Flash or GPT-6 Astra?
GPT-6 Astra ranks higher across coding benchmarks like WebDev Arena and SciCode: 92nd vs 74th percentile among the models tracked on Model Beat.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.