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Head-to-head comparison

GPT-5.3-Codex vs Qwen3.5 397B A17B

GPT-5.3-Codex (OpenAI) and Qwen3.5 397B A17B (Qwen) compared on the ModelCap Index, API price, context window, provider availability, weight access and every public benchmark board they share. Figures are the same ones shown on the live rankings; nothing here is a hidden score.

Snapshot as of 17 August 2026

As of 17 August 2026, GPT-5.3-Codex holds the stronger ModelCap Index position (#20 vs #27); Qwen3.5 397B A17B is 6× cheaper per output token ($2.34/1M vs $14.00/1M); GPT-5.3-Codex offers the longer context window (400K vs 262K tokens); and Qwen3.5 397B A17B ships open weights.

Which should you choose?

Choose GPT-5.3-Codex if…

  • you want the stronger overall ModelCap Index position — #20 against #27 (66.4 vs 62.3 points).
  • you need the longer context window — 400K tokens against 262K.
  • Artificial Analysis Intelligence Index is your yardstick — 45.5 against 34.3.
  • you want the more recently listed model — GPT-5.3-Codex was listed 24 February 2026, Qwen3.5 397B A17B 16 February 2026.

Choose Qwen3.5 397B A17B if…

  • API cost matters — $2.34/1M output tokens against $14.00/1M, about 6× cheaper.
  • your workload is prompt-heavy — input tokens cost $0.39/1M against $1.75/1M.
  • you want to self-host: Qwen3.5 397B A17B ships open weights while GPT-5.3-Codex is api only.
  • you want provider choice — 11 listed API providers against 2.

GPT-5.3-Codex vs Qwen3.5 397B A17B: specs, pricing and context

Specification comparison of GPT-5.3-Codex and Qwen3.5 397B A17B
FieldGPT-5.3-CodexOpenAIQwen3.5 397B A17BQwen
ModelCap Index position#20#27
Index score66.462.3
EvidenceMeasuredMeasured
Input price / 1M tokens$1.75$0.39
Output price / 1M tokens$14.00$2.34
Context window400K tokens262K tokens
Max output tokens128K66K
API providers listed211
Weight accessAPI onlyOpen weights
Input modalitiesText, Image, FileText, Image, Video
First listed24 February 202616 February 2026
PublisherOpenAIQwen

Evidence: 1 public benchmark observation across 1 board · 3 public benchmark observations across 3 boards. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: GPT-5.3-Codex vs Qwen3.5 397B A17B

Public benchmark boards where GPT-5.3-Codex or Qwen3.5 397B A17B has a published result
BoardGPT-5.3-CodexQwen3.5 397B A17BLeads
Arena codingArena (LMArena)—14911486–1497Only one result
Artificial Analysis Intelligence IndexArtificial Analysis45.5intelligence-index34.3intelligence-indexGPT-5.3-Codex

Scores are the sources' own published figures for each model's best evaluated configuration; ModelCap never re-runs a benchmark.

Want a different pairing? Open the interactive comparison tool to swap either model for any current ranked language model.

GPT-5.3-Codex vs Qwen3.5 397B A17B: common questions

Is GPT-5.3-Codex better than Qwen3.5 397B A17B?

GPT-5.3-Codex ranks higher on the ModelCap Index as of 17 August 2026: #20 against #27. That is a capability ranking built from public benchmark evidence with published uncertainty; whether it is "better" for you also depends on price, context and where you can run it.

Is GPT-5.3-Codex cheaper than Qwen3.5 397B A17B?

Qwen3.5 397B A17B is cheaper on output tokens: $2.34/1M against $14.00/1M. Input tokens are $1.75/1M for GPT-5.3-Codex and $0.39/1M for Qwen3.5 397B A17B. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens.

Which has the bigger context window, GPT-5.3-Codex or Qwen3.5 397B A17B?

GPT-5.3-Codex has the larger context window: 400K tokens against 262K.

Which is better for coding, GPT-5.3-Codex or Qwen3.5 397B A17B?

The two models do not share a coding benchmark board on ModelCap yet, so no head-to-head coding score is published; the ModelCap Index position is the closest overall signal.

Are GPT-5.3-Codex and Qwen3.5 397B A17B open-weight models?

GPT-5.3-Codex: API only. Qwen3.5 397B A17B: Open weights. Open weights mean the checkpoint can be downloaded and self-hosted under its licence; API-only models are available solely through hosted endpoints.

Where can I run GPT-5.3-Codex and Qwen3.5 397B A17B?

ModelCap currently lists 2 API providers for GPT-5.3-Codex and 11 for Qwen3.5 397B A17B, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this GPT-5.3-Codex vs Qwen3.5 397B A17B comparison?

Every figure comes from the sealed ModelCap dataset published 17 August 2026; the page re-renders within a minute of each data refresh, and the ModelCap Index positions are the same ones shown on the live rankings.

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