GPT-5.1 Codex High vs Qwen3.8 Max: Specs & Benchmark Comparison
GPT-5.1 Codex High is developed by OpenAI, while Qwen3.8 Max comes from Alibaba. GPT-5.1 Codex High was released in November 2025, and Qwen3.8 Max followed 9 months later in August 2026. Qwen3.8 Max has a published size of about 2.4 trillion parameters; OpenAI has not disclosed the parameter count of GPT-5.1 Codex High.
We have 1 benchmark result for GPT-5.1 Codex High and 42 benchmark results for Qwen3.8 Max, but they were measured on different benchmarks, so there is no like-for-like scoreboard.
GPT-5.1 Codex High is the cheaper API at $1.25 per million input tokens and $10 per million output tokens, roughly 2 times cheaper than Qwen3.8 Max at $2.50 and $6.25. Qwen3.8 Max takes the larger context window at 1M tokens, compared with 400K for GPT-5.1 Codex High. Both accept text and images as input.
| Characteristic | GPT-5.1 Codex High | Qwen3.8 Max |
|---|---|---|
| Company | OpenAI | Alibaba |
| Release Date | November 11, 2025 | August 2, 2026 |
| Parameters | — | 2.4T |
| Multimodal | Yes | Yes |
| Context (input) | 400K | 1.0M |
| Context (output) | 128K | 131K |
| Input Price / 1M | $1.25 | $2.50 |
| Output Price / 1M | $10.00 | $6.25 |
| Average Score | 97.0% | 71.0% |
Verdict
Qwen3.8 Max leads in 3 out of 4 comparison categories.
Both models show comparable average scores: GPT-5.1 Codex High — 1.0, Qwen3.8 Max — 0.7.
Qwen3.8 Max is 1.3x cheaper: input $2.50/1M vs $1.25/1M tokens.
Qwen3.8 Max supports a larger context: 1M vs 400K tokens.
Qwen3.8 Max is newer: released 8/2/2026 vs 11/11/2025.
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Frequently Asked Questions
Which is better for coding — GPT-5.1 Codex High or Qwen3.8 Max?
Which model is cheaper — GPT-5.1 Codex High or Qwen3.8 Max?
Which has a larger context window — GPT-5.1 Codex High or Qwen3.8 Max?
The GPT-5.1 Codex High and Qwen3.8 Max 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 Max page. See also the complete list of AI model comparisons.