GLM-5.3 Flash vs GPT-5.6 Sol: Specs & Benchmark Comparison
GLM-5.3 Flash is developed by Zhipu AI, while GPT-5.6 Sol comes from OpenAI. GPT-5.6 Sol was released in July 2026, and GLM-5.3 Flash followed a month later in August 2026. GLM-5.3 Flash has a published size of about 320 billion parameters; OpenAI has not disclosed the parameter count of GPT-5.6 Sol.
The two models share 6 published benchmarks. GPT-5.6 Sol leads on 4 of them, GLM-5.3 Flash on 2. The widest gaps are on AutomationBench v1.0.6, where GLM-5.3 Flash scores 48.8% against 18.1%; Agents' Last Exam, where GPT-5.6 Sol scores 52.7% against 26.3%. Averaged across everything we track, GLM-5.3 Flash sits at 64.1% and GPT-5.6 Sol at 63.9%.
GLM-5.3 Flash is the cheaper API at $0.15 per million input tokens and $0.50 per million output tokens, roughly 33 times cheaper than GPT-5.6 Sol at $5 and $30. Both accept a context window of about 1M tokens. GLM-5.3 Flash accepts text, images, and video as input, while GPT-5.6 Sol accepts text and images.
| Characteristic | GLM-5.3 Flash | GPT-5.6 Sol |
|---|---|---|
| Company | Zhipu AI | OpenAI |
| Release Date | August 26, 2026 | July 9, 2026 |
| Parameters | 320B | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.1M |
| Context (output) | 131K | 128K |
| Input Price / 1M | $0.15 | $5.00 |
| Output Price / 1M | $0.50 | $30.00 |
| Average Score | 64.1% | 63.9% |
| Benchmarks | ||
| AutomationBench v1.0.6 | 48.8% | 18.1% |
| Agents' Last Exam | 26.3% | 52.7% |
| Toolathlon Verified | 78.4% | 58.0% |
| DeepSWE 1.1 | 63.4% | 73.0% |
| Terminal-Bench 2.1 | 84.3% | 88.8% |
| Artificial Analysis | 57.0% | 59.0% |
Visual Benchmark Comparison
Verdict
GLM-5.3 Flash leads in 2 out of 4 comparison categories.
Both models show comparable average scores: GLM-5.3 Flash — 0.6, GPT-5.6 Sol — 0.6.
GLM-5.3 Flash is 53.8x cheaper: input $0.15/1M vs $5.00/1M tokens.
GPT-5.6 Sol supports a larger context: 1M vs 1M tokens.
GLM-5.3 Flash is newer: released 8/26/2026 vs 7/9/2026.
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Frequently Asked Questions
Which is better for coding — GLM-5.3 Flash or GPT-5.6 Sol?
Which model is cheaper — GLM-5.3 Flash or GPT-5.6 Sol?
Which has a larger context window — GLM-5.3 Flash or GPT-5.6 Sol?
The GLM-5.3 Flash and GPT-5.6 Sol 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-5.6 Sol page. See also the complete list of AI model comparisons.