# Claude Haiku 4.5 vs GPT-4o-mini: which cheap fast model wins in 2026?

**Source:** https://promtable.com/compare/claude-haiku-vs-gpt-4o-mini

> Claude Haiku 4.5 wins on instruction-following + tool use reliability. GPT-4o-mini wins on ecosystem and slightly lower cost. Pick Haiku for routing + structured output, GPT-4o-mini for OpenAI-native cheap tier.

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Claude Haiku 4.5 wins on instruction-following + tool use reliability. GPT-4o-mini wins on ecosystem and slightly lower cost. Pick Haiku for routing + structured output, GPT-4o-mini for OpenAI-native cheap tier.

## At a glance

| Dimension | Claude Haiku 4.5 | GPT-4o-mini |
|---|---|---|
| Instruction following | **Tightest in cheap tier** ✓ | Good |
| Tool use / function calling | **Best in cheap tier** ✓ | Solid |
| Code quality | **Strong** ✓ | Good |
| Multimodal | Image input | **Image + audio input** ✓ |
| Context window | **200K** ✓ | 128K |
| Speed | Fast | Fast |
| Price (input/output per 1M) | ~$0.80 / $4.00 | **~$0.15 / $0.60** ✓ |
| Ecosystem (SDKs, tools) | Anthropic + Bedrock + Vertex | **OpenAI + Azure** ✓ |
| Best for | Routing, structured output, agent steps | OpenAI-native cheap tier |

## Verdict

Claude Haiku 4.5 is the right cheap-tier pick for agent routing, structured output, and tool-use reliability — instruction-following holds up better at the low end. GPT-4o-mini is the right pick for OpenAI-native stacks and cost-sensitive workloads where pure ecosystem fit + price-per-token matter. Many production stacks use both — Haiku as the router or executor on tool-heavy steps, GPT-4o-mini for bulk classification + extraction.

## When to pick which

- **Claude Haiku 4.5** — Agent routing, structured output, tool use, instruction-critical cheap-tier work.
- **GPT-4o-mini** — OpenAI-native, cheapest-per-token, multimodal (audio + image).

## FAQ

### Haiku or GPT-4o-mini for routing?

Haiku — best in cheap tier on tool use + instruction following.

### Cheapest of the two?

GPT-4o-mini — materially cheaper per token in 2026.

### Best for multimodal?

GPT-4o-mini — audio + image input native.

## Related

- [/compare/gemini-2-flash-vs-claude-haiku](https://promtable.com/compare/gemini-2-flash-vs-claude-haiku)
- [/compare/claude-vs-gpt-4o](https://promtable.com/compare/claude-vs-gpt-4o)
- [/glossary/model-router](https://promtable.com/glossary/model-router)

*Last updated: 2026-06-01*
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