Skip to main content

GPT-5.3 Codex vs Qwen3.5 397B (Reasoning)

Head-to-head comparison across 0benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.

Benchmark data for one or both models is coming soon. This page currently shows metadata and pricing where BenchLM has it, and score-level comparisons will populate as public benchmark results land.

GPT-5.3 Codex

89

VS

Qwen3.5 397B (Reasoning)

--

0 categoriesvs0 categories

Benchmark data for GPT-5.3 Codex and Qwen3.5 397B (Reasoning) is coming soon on BenchLM.

Category Radar

Head-to-Head by Category

Operational Comparison

GPT-5.3 Codex

Qwen3.5 397B (Reasoning)

Price (per 1M tokens)

$2.5 / $10

$0 / $0

Speed

79 t/s

N/A

Latency (TTFT)

88.26s

N/A

Context Window

400K

128K

Quick Verdict

Benchmark data for GPT-5.3 Codex and Qwen3.5 397B (Reasoning) is coming soon on BenchLM.

BenchLM does not have sourced benchmark coverage for Qwen3.5 397B (Reasoning) yet. This comparison is currently limited to metadata such as context window, reasoning mode, and pricing where available.

GPT-5.3 Codex is priced at $2.50 input / $10.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for Qwen3.5 397B (Reasoning). GPT-5.3 Codex has the larger context window at 400K, compared with 128K for Qwen3.5 397B (Reasoning).

Benchmark Deep Dive

Frequently Asked Questions (3)

Can I compare GPT-5.3 Codex and Qwen3.5 397B (Reasoning) on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.

Why does this comparison show “coming soon”?

BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.

What data is available for GPT-5.3 Codex and Qwen3.5 397B (Reasoning) today?

GPT-5.3 Codex: $2.50 input / $10.00 output per 1M tokens Qwen3.5 397B (Reasoning): $0.00 input / $0.00 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.

Related Comparisons

Last updated: April 20, 2026

The AI models change fast. We track them for you.

For engineers, researchers, and the plain curious — a weekly brief on new models, ranking shifts, and pricing changes.

Free. No spam. Unsubscribe anytime.