LLM Reference

Claude Haiku 4.5 vs o3 Mini

Claude Haiku 4.5 (2025) and o3 Mini (2025) are frontier reasoning models from Anthropic and OpenAI. Claude Haiku 4.5 ships a 200k-token context window, while o3 Mini ships a 200k-token context window. On SWE-bench Verified, Claude Haiku 4.5 leads by 24 pts. On pricing, Claude Haiku 4.5 costs $0.80/1M input tokens versus $1.10/1M 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.

Claude Haiku 4.5 is safer overall; choose o3 Mini when coding workflow support matters.

Decision scorecard

Local evidence first
SignalClaude Haiku 4.5o3 Mini
Best formultimodal apps, tool-calling agents, and provider-routed productionreasoning-heavy apps, tool-calling agents, and provider-routed production
Decision fitCoding, RAG, and AgentsCoding, RAG, and Agents
Context window200k200k
Cheapest output$4/1M tokens$4.40/1M tokens
Provider routes9 tracked4 tracked
Shared benchmarksSWE-bench Verified leader1 shared

Decision tradeoffs

Choose Claude Haiku 4.5 when...
  • Claude Haiku 4.5 holds a shared-benchmark lead on SWE-bench Verified, ahead by 24 points.
  • Claude Haiku 4.5 has the lower cheapest tracked output price at $4/1M tokens.
  • Claude Haiku 4.5 has broader tracked provider coverage for fallback and route flexibility.
  • Claude Haiku 4.5 uniquely exposes Vision and Multimodal in local model data.
  • Local decision data tags Claude Haiku 4.5 for Coding, RAG, and Agents.
Choose o3 Mini when...
  • o3 Mini uniquely exposes Reasoning in local model data.
  • Local decision data tags o3 Mini 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.

Lower estimate Claude Haiku 4.5

Claude Haiku 4.5

$1,640

Cheapest tracked route/tier: AWS Bedrock

o3 Mini

$1,980

Cheapest tracked route/tier: OpenRouter

Estimated monthly gap: $340. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

Claude Haiku 4.5 -> o3 Mini
  • Provider overlap exists on OpenRouter and Vercel AI Gateway; start route-level A/B tests there.
  • o3 Mini is $0.40/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
  • Check replacement coverage for Vision and Multimodal before moving production traffic.
  • o3 Mini adds Reasoning in local capability data.
o3 Mini -> Claude Haiku 4.5
  • Provider overlap exists on OpenRouter and Vercel AI Gateway; start route-level A/B tests there.
  • Claude Haiku 4.5 is $0.40/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
  • Check replacement coverage for Reasoning before moving production traffic.
  • Claude Haiku 4.5 adds Vision and Multimodal in local capability data.

Specs

Specification
Released2025-10-012025-01-31
Context window200k200k
Parameters——
ArchitectureDecoder OnlyDecoder Only
LicenseProprietaryProprietary
OpennessProprietaryProprietary
WeightsNot releasedNot released
CodeUnknownUnknown
Commercial useCommercial use: conditionalCommercial use: conditional
Knowledge cutoff2025-022025-04

Pricing and availability

Pricing attributeClaude Haiku 4.5o3 Mini
Input price$0.80/1M tokens$1.10/1M tokens
Output price$4/1M tokens$4.40/1M tokens
Providers
Microsoft FoundryAnthropicSnowflake CortexAWS BedrockGCP Vertex AIOpenRouter
OpenRouterAzure OpenAIOpenAI APIVercel AI Gateway

Capabilities

CapabilityClaude Haiku 4.5o3 Mini
VisionYesNo
MultimodalYesNo
ReasoningNoYes
JSON / Tool useYesYes
Structured outputsYesYes
Code executionYesYes
IDE integrationNoNo
Computer useNoNo
Parallel agentsNoNo

Benchmarks

BenchmarkClaude Haiku 4.5o3 Mini
SWE-bench Verified73.349.3

Continue comparing

Model pages
Labs and families
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Last reviewed: 2026-07-26. Data sourced from public model cards and provider documentation.