Grok 4.5 vs Qwen3.8 Flash: Specs & Benchmark Comparison
Grok 4.5 is developed by xAI, while Qwen3.8 Flash comes from Alibaba. Grok 4.5 was released in July 2026, and Qwen3.8 Flash followed a month later in August 2026. Qwen3.8 Flash has a published size of about 125 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 on 1. The widest gaps are on DeepSWE 1.1, where Qwen3.8 Flash 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 at 68.5%.
Qwen3.8 Flash is the cheaper API at $0.15 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 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 accepts text, images, and video. On tooling, only Grok 4.5 supports function calling and only Grok 4.5 offers structured output.
| Characteristic | Grok 4.5 | Qwen3.8 Flash |
|---|---|---|
| Company | xAI | Alibaba |
| Release Date | July 16, 2026 | August 26, 2026 |
| Parameters | — | 125B |
| Multimodal | Yes | Yes |
| Context (input) | 500K | 1.0M |
| Context (output) | — | 131K |
| Input Price / 1M | $2.00 | $0.15 |
| Output Price / 1M | $6.00 | $0.47 |
| Average Score | 52.9% | 68.5% |
| 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 leads in 3 out of 4 comparison categories.
Both models show comparable average scores: Grok 4.5 — 0.5, Qwen3.8 Flash — 0.7.
Qwen3.8 Flash is 12.9x cheaper: input $0.15/1M vs $2.00/1M tokens.
Qwen3.8 Flash supports a larger context: 1M vs 500K tokens.
Qwen3.8 Flash 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?
Which model is cheaper — Grok 4.5 or Qwen3.8 Flash?
Which has a larger context window — Grok 4.5 or Qwen3.8 Flash?
The Grok 4.5 and Qwen3.8 Flash 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 page. See also the complete list of AI model comparisons.