LLM Reference

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

GPT-5.3-Codex-Spark (2026) and Qwen3.5-397B-A17B (2026) compare a coding-specialized model against a standalone API model. GPT-5.3-Codex-Spark ships a 131k-token context window, while Qwen3.5-397B-A17B ships a 262k-token context window. This page treats the result as workflow and deployment fit, not a universal model winner.

Treat this as a product-type comparison: GPT-5.3-Codex-Spark is coding-specialized model, while Qwen3.5-397B-A17B is standalone API model. Choose based on workflow fit before reading any benchmark or price row as decisive.

Decision scorecard

Local evidence first
SignalGPT-5.3-Codex-SparkQwen3.5-397B-A17B
Product typeCoding-specialized modelStandalone API model
Best forcustom coding agents, code generation, and tool loopsreasoning-heavy apps, multimodal apps, and tool-calling agents
Decision fitCoding, RAG, and AgentsCoding, RAG, and Agents
Context window131k262k
Cheapest output-$2.34/1M tokens
Provider routes1 tracked4 tracked
Shared benchmarks0 shared0 shared

Decision tradeoffs

Choose GPT-5.3-Codex-Spark when...
  • GPT-5.3-Codex-Spark uniquely exposes Code execution in local model data.
  • Local decision data tags GPT-5.3-Codex-Spark for Coding, RAG, and Agents.
Choose Qwen3.5-397B-A17B when...
  • Qwen3.5-397B-A17B has the larger context window for long prompts, retrieval packs, or transcript analysis.
  • Qwen3.5-397B-A17B has broader tracked provider coverage for fallback and route flexibility.
  • Qwen3.5-397B-A17B uniquely exposes Vision, Multimodal, and Reasoning in local model data.
  • Local decision data tags Qwen3.5-397B-A17B for Coding, RAG, and Agents.

Monthly cost at traffic

Estimate token spend from the cheapest tracked input and output route or tier on this page.

GPT-5.3-Codex-Spark

Unavailable

No complete token price in local provider data

Qwen3.5-397B-A17B

$897

Cheapest tracked route/tier: OpenRouter

Cost delta unavailable until both models have sourced input and output token prices.

Switch friction

GPT-5.3-Codex-Spark -> Qwen3.5-397B-A17B
  • No overlapping tracked provider route is sourced for GPT-5.3-Codex-Spark and Qwen3.5-397B-A17B; plan for SDK, billing, or endpoint changes.
  • Check replacement coverage for Code execution before moving production traffic.
  • Qwen3.5-397B-A17B adds Vision, Multimodal, and Reasoning in local capability data.
Qwen3.5-397B-A17B -> GPT-5.3-Codex-Spark
  • No overlapping tracked provider route is sourced for Qwen3.5-397B-A17B and GPT-5.3-Codex-Spark; plan for SDK, billing, or endpoint changes.
  • Check replacement coverage for Vision, Multimodal, and Reasoning before moving production traffic.
  • GPT-5.3-Codex-Spark adds Code execution in local capability data.

Specs

Specification
Released2026-02-122026-02-16
Context window131k262k
Parameters—397B
ArchitectureDecoder OnlyMixture of Experts
LicenseProprietaryApache 2.0OSI-approved
OpennessProprietaryOpen source
WeightsNot releasedAvailable
CodeUnknownUnknown
Commercial useCommercial use: conditionalCommercial use: permitted
Knowledge cutoff--

Pricing and availability

Pricing attributeGPT-5.3-Codex-SparkQwen3.5-397B-A17B
Input price-$0.39/1M tokens
Output price-$2.34/1M tokens
Providers
OpenAI API
OpenRouterTogether AIAlibaba Cloud PAI-EASNovita AI

Capabilities

CapabilityGPT-5.3-Codex-SparkQwen3.5-397B-A17B
VisionNoYes
MultimodalNoYes
ReasoningNoYes
JSON / Tool useYesYes
Structured outputsYesYes
Code executionYesNo
IDE integrationNoNo
Computer useNoNo
Parallel agentsNoNo

Benchmarks

No shared benchmark scores are currently available for this pair.

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Model pages
Labs and families
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Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.