Claude Haiku 4.5 vs o4-mini
Claude Haiku 4.5 (2025) and o4-mini (2025) are frontier reasoning models from Anthropic and OpenAI. Claude Haiku 4.5 ships a 200k-token context window, while o4-mini ships a not-yet-sourced context window. On SWE-bench Verified, Claude Haiku 4.5 leads by 5.2 pts. On pricing, o4-mini costs $0.5/1M input tokens versus $0.8/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
o4-mini is ~60% cheaper at $0.5/1M; pay for Claude Haiku 4.5 only for coding workflow support.
Specs
| Released | 2025-10-01 | 2025-04-16 |
| Context window | 200k | — |
| Parameters | — | — |
| Architecture | decoder only | decoder only |
| License | Proprietary | Proprietary |
| Knowledge cutoff | 2025-02 | 2025-08 |
Pricing and availability
| Claude Haiku 4.5 | o4-mini | |
|---|---|---|
| Input price | $0.8/1M tokens | $0.5/1M tokens |
| Output price | $4/1M tokens | $2/1M tokens |
| Providers |
Capabilities
| Claude Haiku 4.5 | o4-mini | |
|---|---|---|
| Vision | ||
| Multimodal | ||
| Reasoning | ||
| Function calling | ||
| Tool use | ||
| Structured outputs | ||
| Code execution |
Benchmarks
| Benchmark | Claude Haiku 4.5 | o4-mini |
|---|---|---|
| SWE-bench Verified | 73.3 | 68.1 |
| BFCL | 68.7 | 53.2 |
| MultiChallenge | 50.5 | 44.9 |
Deep dive
On shared benchmark coverage, SWE-bench Verified has Claude Haiku 4.5 at 73.3 and o4-mini at 68.1, with Claude Haiku 4.5 ahead by 5.2 points; BFCL has Claude Haiku 4.5 at 68.7 and o4-mini at 53.2, with Claude Haiku 4.5 ahead by 15.5 points; MultiChallenge has Claude Haiku 4.5 at 50.5 and o4-mini at 44.9, with Claude Haiku 4.5 ahead by 5.6 points. The largest visible gap is 15.5 points on BFCL, which matters most when that benchmark mirrors your workload. Treat isolated benchmark wins as directional, because provider routing, prompt style, and tool access can move real application results.
The capability footprint differs most on reasoning mode: o4-mini. Both models share vision, multimodal input, function calling, and tool use, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, Claude Haiku 4.5 lists $0.8/1M input and $4/1M output tokens, while o4-mini lists $0.5/1M input and $2/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts o4-mini lower by about $0.81 per million blended tokens. Availability is 8 providers versus 4, so concentration risk also matters.
Choose Claude Haiku 4.5 when coding workflow support and broader provider choice are central to the workload. Choose o4-mini when coding workflow support and lower input-token cost are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which is cheaper, Claude Haiku 4.5 or o4-mini?
o4-mini is cheaper on tracked token pricing. Claude Haiku 4.5 costs $0.8/1M input and $4/1M output tokens. o4-mini costs $0.5/1M input and $2/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Claude Haiku 4.5 or o4-mini open source?
Claude Haiku 4.5 is listed under Proprietary. o4-mini is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, Claude Haiku 4.5 or o4-mini?
Both Claude Haiku 4.5 and o4-mini expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Which is better for multimodal input, Claude Haiku 4.5 or o4-mini?
Both Claude Haiku 4.5 and o4-mini expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Which is better for reasoning mode, Claude Haiku 4.5 or o4-mini?
o4-mini has the clearer documented reasoning mode signal in this comparison. If reasoning mode is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run Claude Haiku 4.5 and o4-mini?
Claude Haiku 4.5 is available on Microsoft Foundry, Anthropic, Snowflake Cortex, AWS Bedrock, and GCP Vertex AI. o4-mini is available on OpenAI API, OpenRouter, OpenAI Batch API, and Replicate API. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-04-27. Data sourced from public model cards and provider documentation.