# Gemini 2 Flash vs Claude Haiku: which cheap fast model should you route to?

**Source:** https://promtable.com/compare/gemini-2-flash-vs-claude-haiku

> Gemini 2 Flash has the longest context and generous free tier; Claude Haiku has tighter instruction-following and stronger tool use. Pick Gemini for long-context cheap work, Haiku for routing and structured output.

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Gemini 2 Flash has the longest context and generous free tier; Claude Haiku has tighter instruction-following and stronger tool use. Pick Gemini for long-context cheap work, Haiku for routing and structured output.

## At a glance

| Dimension | Gemini 2 Flash | Claude Haiku 4.5 |
|---|---|---|
| Speed (tokens/sec) | Very fast | Very fast |
| Context window | **1M tokens** ✓ | 200K tokens |
| Instruction following | Good | **Tighter** ✓ |
| Tool use / function calling | Solid | **Best in the cheap tier** ✓ |
| Free tier | **Generous via AI Studio** ✓ | Limited via Claude.ai |
| Price (input/output per 1M) | **~$0.10 / $0.40** ✓ | ~$0.80 / $4.00 |
| Multimodal | **Image + audio + video native** ✓ | Image input |
| Refusal rate | Stricter | **Lower** ✓ |

## Verdict

Gemini 2 Flash is the right cheap-and-fast model for long-context jobs, multimodal input, and projects with a real free-tier budget. Claude Haiku 4.5 wins as a router and structured-output workhorse — tighter instruction following and best-in-tier function calling make it the safer pick for agent step decisions and JSON extraction. Most production stacks in 2026 use both: Gemini for long context, Haiku for routing.

## When to pick which

- **Gemini 2 Flash** — Long context jobs, multimodal, free-tier prototyping, cheap bulk inference.
- **Claude Haiku 4.5** — Agent routing, JSON extraction, structured output, instruction-following-critical work.

## FAQ

### Which is cheaper, Gemini Flash or Claude Haiku?

Gemini 2 Flash is materially cheaper per token in 2026, and has a real free tier.

### Which is better at function calling?

Claude Haiku 4.5 — Anthropic's tool use ergonomics still lead the cheap tier in 2026.

### Which one handles 1M tokens?

Gemini 2 Flash. Claude Haiku tops out at ~200K.

## Related

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

*Last updated: 2026-06-01*
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Original page: https://promtable.com/compare/gemini-2-flash-vs-claude-haiku
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