Grok 4.5 vs Qwen3.8 Flash Next: Specs & Benchmark Comparison
Grok 4.5 is developed by xAI, while Qwen3.8 Flash Next comes from Alibaba. Grok 4.5 was released in July 2026, and Qwen3.8 Flash Next followed a month later in August 2026. Qwen3.8 Flash Next has a published size of about 180 billion parameters; xAI has not disclosed the parameter count of Grok 4.5.
The two models share 3 published benchmarks. Grok 4.5 leads on 2 of them, Qwen3.8 Flash Next on 1. The widest gaps are on DeepSWE 1.1, where Qwen3.8 Flash Next scores 58.7% against 54.0%; SWE-Bench Pro, where Grok 4.5 scores 65.0% against 62.5%. Averaged across everything we track, Grok 4.5 sits at 52.9% and Qwen3.8 Flash Next at 69.7%.
Qwen3.8 Flash Next is the cheaper API at $0.16 per million input tokens and $0.47 per million output tokens, roughly 13 times cheaper than Grok 4.5 at $2 and $6. Qwen3.8 Flash Next takes the larger context window at 1M tokens, compared with 500K for Grok 4.5. Grok 4.5 accepts text and images as input, while Qwen3.8 Flash Next accepts text, images, and video.
| Characteristic | Grok 4.5 | Qwen3.8 Flash Next |
|---|---|---|
| Company | xAI | Alibaba |
| Release Date | July 16, 2026 | August 26, 2026 |
| Parameters | — | 180B |
| Multimodal | Yes | Yes |
| Context (input) | 500K | 1.0M |
| Context (output) | — | 66K |
| Input Price / 1M | $2.00 | $0.16 |
| Output Price / 1M | $6.00 | $0.47 |
| Average Score | 52.9% | 69.7% |
| Benchmarks | ||
| DeepSWE 1.1 | 54.0% | 58.7% |
| SWE-Bench Pro | 65.0% | 62.5% |
| GPQA | 93.0% | 91.7% |
Visual Benchmark Comparison
Verdict
Qwen3.8 Flash Next leads in 3 out of 4 comparison categories.
Both models show comparable average scores: Grok 4.5 — 0.5, Qwen3.8 Flash Next — 0.7.
Qwen3.8 Flash Next is 12.7x cheaper: input $0.16/1M vs $2.00/1M tokens.
Qwen3.8 Flash Next supports a larger context: 1M vs 500K tokens.
Qwen3.8 Flash Next is newer: released 8/26/2026 vs 7/16/2026.
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Frequently Asked Questions
Which is better for coding — Grok 4.5 or Qwen3.8 Flash Next?
Which model is cheaper — Grok 4.5 or Qwen3.8 Flash Next?
Which has a larger context window — Grok 4.5 or Qwen3.8 Flash Next?
The Grok 4.5 and Qwen3.8 Flash Next comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Grok 4.5 or Qwen3.8 Flash Next page. See also the complete list of AI model comparisons.