GLM-5.3 Flash vs GPT-6 Astra: Specs & Benchmark Comparison
GLM-5.3 Flash is developed by Zhipu AI, while GPT-6 Astra comes from OpenAI. GLM-5.3 Flash was released in August 2026, and GPT-6 Astra followed a month later in September 2026. GLM-5.3 Flash has a published size of about 320 billion parameters; OpenAI has not disclosed the parameter count of GPT-6 Astra.
The two models share 3 published benchmarks. GPT-6 Astra leads on 2 of them, GLM-5.3 Flash on 1. The widest gaps are on Agents' Last Exam, where GPT-6 Astra scores 59.3% against 26.3%; DeepSWE 1.1, where GPT-6 Astra scores 74.1% against 63.4%. Averaged across everything we track, GLM-5.3 Flash sits at 64.1% and GPT-6 Astra at 74.4%.
GLM-5.3 Flash is the cheaper API at $0.15 per million input tokens and $0.50 per million output tokens, roughly 67 times cheaper than GPT-6 Astra at $10 and $50. Both accept a context window of about 1M tokens. GLM-5.3 Flash accepts text, images, and video as input, while GPT-6 Astra accepts text and images.
| Characteristic | GLM-5.3 Flash | GPT-6 Astra |
|---|---|---|
| Company | Zhipu AI | OpenAI |
| Release Date | August 26, 2026 | September 4, 2026 |
| Parameters | 320B | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.1M |
| Context (output) | 131K | 128K |
| Input Price / 1M | $0.15 | $10.00 |
| Output Price / 1M | $0.50 | $50.00 |
| Average Score | 64.1% | 74.4% |
| Benchmarks | ||
| Agents' Last Exam | 26.3% | 59.3% |
| DeepSWE 1.1 | 63.4% | 74.1% |
| AutomationBench v1.0.6 | 48.8% | 41.4% |
Visual Benchmark Comparison
Verdict
Both models show equal results — the choice depends on your specific use case.
Both models show comparable average scores: GLM-5.3 Flash — 0.6, GPT-6 Astra — 0.7.
GLM-5.3 Flash is 92.3x cheaper: input $0.15/1M vs $10.00/1M tokens.
GPT-6 Astra supports a larger context: 1M vs 1M tokens.
Both models were released around the same time: 8/26/2026 and 9/4/2026.
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Frequently Asked Questions
Which is better for coding — GLM-5.3 Flash or GPT-6 Astra?
Which model is cheaper — GLM-5.3 Flash or GPT-6 Astra?
Which has a larger context window — GLM-5.3 Flash or GPT-6 Astra?
The GLM-5.3 Flash and GPT-6 Astra comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GLM-5.3 Flash or GPT-6 Astra page. See also the complete list of AI model comparisons.