GLM-5.3 Flash vs GPT-6.1 Sol: Specs & Benchmark Comparison
GLM-5.3 Flash is developed by Zhipu AI, while GPT-6.1 Sol comes from OpenAI. GLM-5.3 Flash was released in August 2026, and GPT-6.1 Sol 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-6.1 Sol.
We have 16 benchmark results for GLM-5.3 Flash and 17 benchmark results for GPT-6.1 Sol, but they overlap on a single test: DeepSWE 1.1, where GPT-6.1 Sol scores 75.2% against 63.4%.
GLM-5.3 Flash is the cheaper API at $0.15 per million input tokens and $0.50 per million output tokens, roughly 13 times cheaper than GPT-6.1 Sol at $2 and $10. Both accept a context window of about 1M tokens. GLM-5.3 Flash accepts text, images, and video as input, while GPT-6.1 Sol accepts text and images.
| Characteristic | GLM-5.3 Flash | GPT-6.1 Sol |
|---|---|---|
| Company | Zhipu AI | OpenAI |
| Release Date | August 26, 2026 | September 29, 2026 |
| Parameters | 320B | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.0M | 1.1M |
| Context (output) | 131K | 128K |
| Input Price / 1M | $0.15 | $2.00 |
| Output Price / 1M | $0.50 | $10.00 |
| Average Score | 64.1% | 62.8% |
| Benchmarks | ||
| DeepSWE 1.1 | 63.4% | 75.2% |
Visual Benchmark Comparison
Verdict
GPT-6.1 Sol leads in 2 out of 4 comparison categories.
Both models show comparable average scores: GLM-5.3 Flash — 0.6, GPT-6.1 Sol — 0.6.
GLM-5.3 Flash is 18.5x cheaper: input $0.15/1M vs $2.00/1M tokens.
GPT-6.1 Sol supports a larger context: 1M vs 1M tokens.
GPT-6.1 Sol is newer: released 9/29/2026 vs 8/26/2026.
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Frequently Asked Questions
Which is better for coding — GLM-5.3 Flash or GPT-6.1 Sol?
Which model is cheaper — GLM-5.3 Flash or GPT-6.1 Sol?
Which has a larger context window — GLM-5.3 Flash or GPT-6.1 Sol?
The GLM-5.3 Flash and GPT-6.1 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-6.1 Sol page. See also the complete list of AI model comparisons.