LLM Reference

Gemini 2.5 Flash vs Phi-3 Mini 4k

Gemini 2.5 Flash (2025) and Phi-3 Mini 4k (2024) are compact production models from Google DeepMind and Microsoft Research. Gemini 2.5 Flash ships a 1m-token context window, while Phi-3 Mini 4k ships a 4k-token context window. On MMLU PRO, Gemini 2.5 Flash leads by 42.7 pts. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.

Phi-3 Mini 4k is ~500% cheaper at $0.05/1M; pay for Gemini 2.5 Flash only for coding workflow support.

Decision scorecard

Local evidence first
SignalGemini 2.5 FlashPhi-3 Mini 4k
Best formultimodal apps, tool-calling agents, and long-context analysisprovider-routed production
Decision fitCoding, RAG, and AgentsCoding and Classification
Context window1m4k
Cheapest output$2.50/1M tokens$0.25/1M tokens
Provider routes6 tracked4 tracked
Shared benchmarksMMLU PRO leader3 shared

Decision tradeoffs

Choose Gemini 2.5 Flash when...
  • Gemini 2.5 Flash holds a shared-benchmark lead on MMLU PRO, ahead by 42.7 points.
  • Gemini 2.5 Flash has the larger context window for long prompts, retrieval packs, or transcript analysis.
  • Gemini 2.5 Flash has broader tracked provider coverage for fallback and route flexibility.
  • Gemini 2.5 Flash uniquely exposes Vision, Multimodal, and JSON / Tool use in local model data.
  • Local decision data tags Gemini 2.5 Flash for Coding, RAG, and Agents.
Choose Phi-3 Mini 4k when...
  • Phi-3 Mini 4k has the lower cheapest tracked output price at $0.25/1M tokens.
  • Local decision data tags Phi-3 Mini 4k for Coding and Classification.

Monthly cost at traffic

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

Lower estimate Phi-3 Mini 4k

Gemini 2.5 Flash

$865

Cheapest tracked route/tier: Google AI Studio

Phi-3 Mini 4k

$103

Cheapest tracked route/tier: Replicate API

Estimated monthly gap: $763. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

Gemini 2.5 Flash -> Phi-3 Mini 4k
  • Provider overlap exists on Replicate API; start route-level A/B tests there.
  • Phi-3 Mini 4k is $2.25/1M 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.
Phi-3 Mini 4k -> Gemini 2.5 Flash
  • Provider overlap exists on Replicate API; start route-level A/B tests there.
  • Gemini 2.5 Flash is $2.25/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
  • Gemini 2.5 Flash adds Vision, Multimodal, and JSON / Tool use in local capability data.

Specs

Specification
Released2025-06-172024-04-23
Context window1m4k
Parameters—3.8B
ArchitectureDecoder OnlyDecoder Only
LicenseProprietaryMITOSI-approved
OpennessProprietaryOpen source
WeightsNot releasedUnknown
CodeUnknownUnknown
Commercial useCommercial use: conditionalCommercial use: permitted
Knowledge cutoff2025-012023-10

Pricing and availability

Pricing attributeGemini 2.5 FlashPhi-3 Mini 4k
Input price$0.30/1M tokens$0.05/1M tokens
Output price$2.50/1M tokens$0.25/1M tokens
Providers
Google AI StudioGCP Vertex AIReplicate APIOpenRouterVercel AI GatewayInceptron
Microsoft FoundryNVIDIA NIMBaseten APIReplicate API

Capabilities

CapabilityGemini 2.5 FlashPhi-3 Mini 4k
VisionYesNo
MultimodalYesNo
ReasoningNoNo
JSON / Tool useYesNo
Structured outputsYesNo
Code executionYesNo
IDE integrationNoNo
Computer useNoNo
Parallel agentsNoNo

Benchmarks

BenchmarkGemini 2.5 FlashPhi-3 Mini 4k
MMLU PRO88.445.7
Google-Proof Q&A82.840.9
HumanEval90.159.8

Continue comparing

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