GPT-5.1 Codex High vs Qwen3.8 Flash: Specs & Benchmark Comparison
| Characteristic | GPT-5.1 Codex High | Qwen3.8 Flash |
|---|---|---|
| Company | OpenAI | Alibaba |
| Release Date | November 11, 2025 | August 26, 2026 |
| Parameters | — | 125B |
| Multimodal | Yes | Yes |
| Context (input) | 400K | 1.0M |
| Context (output) | 128K | 131K |
| Input Price / 1M | $1.25 | $0.15 |
| Output Price / 1M | $10.00 | $0.47 |
| Average Score | 1.0 | 0.7 |
Verdict
Qwen3.8 Flash leads in 3 out of 4 comparison categories.
Overall Performance
Both models show comparable average scores: GPT-5.1 Codex High — 1.0, Qwen3.8 Flash — 0.7.
API Cost
Qwen3.8 Flash is 18.1x cheaper: input $0.15/1M vs $1.25/1M tokens.
Context Window
Qwen3.8 Flash supports a larger context: 1M vs 400K tokens.
Recency
Qwen3.8 Flash is newer: released 8/26/2026 vs 11/11/2025.
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Frequently Asked Questions
Which is better for coding — GPT-5.1 Codex High or Qwen3.8 Flash?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — GPT-5.1 Codex High or Qwen3.8 Flash?
Qwen3.8 Flash is cheaper for input: $0.15 per 1M tokens vs $1.25.
Which has a larger context window — GPT-5.1 Codex High or Qwen3.8 Flash?
Qwen3.8 Flash supports a larger context: 1,048,576 tokens vs 400,000.
The GPT-5.1 Codex High 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 GPT-5.1 Codex High or Qwen3.8 Flash page. See also the complete list of AI model comparisons.