LLM Reference

GPT-5.3-Codex-Spark vs Magistral Small 2506

GPT-5.3-Codex-Spark (2026) and Magistral Small 2506 (2025) compare a coding-specialized model against a standalone API model. GPT-5.3-Codex-Spark ships a 131k-token context window, while Magistral Small 2506 ships a 128k-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 Magistral Small 2506 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-SparkMagistral Small 2506
Product typeCoding-specialized modelStandalone API model
Best forcustom coding agents, code generation, and tool loopsreasoning-heavy apps
Decision fitCoding, RAG, and AgentsLong context
Context window131k128k
Cheapest output--
Provider routes1 tracked1 tracked
Shared benchmarks0 shared0 shared

Decision tradeoffs

Choose GPT-5.3-Codex-Spark when...
  • GPT-5.3-Codex-Spark has the larger context window for long prompts, retrieval packs, or transcript analysis.
  • GPT-5.3-Codex-Spark uniquely exposes JSON / Tool use, Structured outputs, and Code execution in local model data.
  • Local decision data tags GPT-5.3-Codex-Spark for Coding, RAG, and Agents.
Choose Magistral Small 2506 when...
  • Magistral Small 2506 uniquely exposes Reasoning in local model data.
  • Local decision data tags Magistral Small 2506 for Long context.

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

Magistral Small 2506

Unavailable

No complete token price in local provider data

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

Switch friction

GPT-5.3-Codex-Spark -> Magistral Small 2506
  • No overlapping tracked provider route is sourced for GPT-5.3-Codex-Spark and Magistral Small 2506; plan for SDK, billing, or endpoint changes.
  • Check replacement coverage for JSON / Tool use, Structured outputs, and Code execution before moving production traffic.
  • Magistral Small 2506 adds Reasoning in local capability data.
Magistral Small 2506 -> GPT-5.3-Codex-Spark
  • No overlapping tracked provider route is sourced for Magistral Small 2506 and GPT-5.3-Codex-Spark; plan for SDK, billing, or endpoint changes.
  • Check replacement coverage for Reasoning before moving production traffic.
  • GPT-5.3-Codex-Spark adds JSON / Tool use, Structured outputs, and Code execution in local capability data.

Specs

Specification
Released2026-02-122025-06-10
Context window131k128k
Parameters—24B
ArchitectureDecoder OnlyDecoder Only
LicenseProprietaryApache 2.0OSI-approved
OpennessProprietaryOpen source
WeightsNot releasedUnknown
CodeUnknownUnknown
Commercial useCommercial use: conditionalCommercial use: permitted
Knowledge cutoff-2025-06

Pricing and availability

Pricing attributeGPT-5.3-Codex-SparkMagistral Small 2506
Input price--
Output price--
Providers
OpenAI API
NVIDIA NIM

Pricing not yet sourced for either model.

Capabilities

CapabilityGPT-5.3-Codex-SparkMagistral Small 2506
VisionNoNo
MultimodalNoNo
ReasoningNoYes
JSON / Tool useYesNo
Structured outputsYesNo
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
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Last reviewed: 2026-06-04. Data sourced from public model cards and provider documentation.