GPT-5.6 Sol vs Kimi K3: Specs & Benchmark Comparison
GPT-5.6 Sol is developed by OpenAI, while Kimi K3 comes from Moonshot AI. Both were released in July 2026. Kimi K3 has a published size of about 2.8 trillion parameters; OpenAI has not disclosed the parameter count of GPT-5.6 Sol.
We have 44 benchmark results for GPT-5.6 Sol and 3 benchmark results for Kimi K3, but they overlap on a single test: GPQA, where GPT-5.6 Sol scores 94.6% against 94.0%.
Kimi K3 is the cheaper API at $3 per million input tokens and $15 per million output tokens, about 67% below GPT-5.6 Sol at $5 and $30. Both accept a context window of about 1M tokens. Both accept text and images as input.
| Characteristic | GPT-5.6 Sol | Kimi K3 |
|---|---|---|
| Company | OpenAI | Moonshot AI |
| Release Date | July 9, 2026 | July 16, 2026 |
| Parameters | — | 2.8T |
| Multimodal | Yes | Yes |
| Context (input) | 1.1M | 1.0M |
| Context (output) | 128K | 1.0M |
| Input Price / 1M | $5.00 | $3.00 |
| Output Price / 1M | $30.00 | $15.00 |
| Average Score | 64.5% | 95.7% |
| Benchmarks | ||
| GPQA | 94.6% | 94.0% |
Visual Benchmark Comparison
Verdict
Both models show equal results — the choice depends on your specific use case.
Both models show comparable average scores: GPT-5.6 Sol — 0.6, Kimi K3 — 1.0.
Kimi K3 is 1.9x cheaper: input $3.00/1M vs $5.00/1M tokens.
GPT-5.6 Sol supports a larger context: 1M vs 1M tokens.
Both models were released around the same time: 7/9/2026 and 7/16/2026.
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Frequently Asked Questions
Which is better for coding — GPT-5.6 Sol or Kimi K3?
Which model is cheaper — GPT-5.6 Sol or Kimi K3?
Which has a larger context window — GPT-5.6 Sol or Kimi K3?
The GPT-5.6 Sol and Kimi K3 comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GPT-5.6 Sol or Kimi K3 page. See also the complete list of AI model comparisons.