LLM Reference

Gemini 3 Pro vs Mistral Magistral Small 2509

Gemini 3 Pro (2025) and Mistral Magistral Small 2509 (2025) are general-purpose language models from Google DeepMind and MistralAI. Gemini 3 Pro ships a 1m-token context window, while Mistral Magistral Small 2509 ships a not-yet-sourced context window. On pricing, Mistral Magistral Small 2509 costs $0.50/1M input tokens versus $1.25/1M for the alternative. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.

Mistral Magistral Small 2509 is ~150% cheaper at $0.50/1M; pay for Gemini 3 Pro only for coding workflow support.

Decision scorecard

Local evidence first
SignalGemini 3 ProMistral Magistral Small 2509
Best formultimodal apps, tool-calling agents, and long-context analysisprovider-routed production
Decision fitCoding, RAG, and AgentsGeneral
Context window1m—
Cheapest output$5/1M tokens$1.50/1M tokens
Provider routes2 tracked2 tracked
Shared benchmarks0 shared0 shared

Decision tradeoffs

Choose Gemini 3 Pro when...
  • Gemini 3 Pro has the larger context window for long prompts, retrieval packs, or transcript analysis.
  • Gemini 3 Pro uniquely exposes Vision, Multimodal, and JSON / Tool use in local model data.
  • Local decision data tags Gemini 3 Pro for Coding, RAG, and Agents.
Choose Mistral Magistral Small 2509 when...
  • Mistral Magistral Small 2509 has the lower cheapest tracked output price at $1.50/1M tokens.

Monthly cost at traffic

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

Lower estimate Mistral Magistral Small 2509

Gemini 3 Pro

$2,250

Cheapest tracked route/tier: GCP Vertex AI

Mistral Magistral Small 2509

$775

Cheapest tracked route/tier: AWS Bedrock

Estimated monthly gap: $1,475. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

Gemini 3 Pro -> Mistral Magistral Small 2509
  • No overlapping tracked provider route is sourced for Gemini 3 Pro and Mistral Magistral Small 2509; plan for SDK, billing, or endpoint changes.
  • Mistral Magistral Small 2509 is $3.50/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
  • Check replacement coverage for Vision, Multimodal, and JSON / Tool use before moving production traffic.
Mistral Magistral Small 2509 -> Gemini 3 Pro
  • No overlapping tracked provider route is sourced for Mistral Magistral Small 2509 and Gemini 3 Pro; plan for SDK, billing, or endpoint changes.
  • Gemini 3 Pro is $3.50/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
  • Gemini 3 Pro adds Vision, Multimodal, and JSON / Tool use in local capability data.

Specs

Specification
Released2025-12-112025-09-01
Context window1m—
Parameters—24B
ArchitectureDecoder Only-
LicenseProprietaryApache 2.0OSI-approved
OpennessProprietaryOpen source
WeightsNot releasedUnknown
CodeUnknownUnknown
Commercial useCommercial use: conditionalCommercial use: permitted
Knowledge cutoff2025-01-

Pricing and availability

Pricing attributeGemini 3 ProMistral Magistral Small 2509
Input price$1.25/1M tokens$0.50/1M tokens
Output price$5/1M tokens$1.50/1M tokens
Providers
Replicate APIGCP Vertex AI
AWS BedrockVercel AI Gateway

Capabilities

CapabilityGemini 3 ProMistral Magistral Small 2509
VisionYesNo
MultimodalYesNo
ReasoningNoNo
JSON / Tool useYesNo
Structured outputsNoNo
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: 2026-09-21. Data sourced from public model cards and provider documentation.