Amazon Q Developer now supports Claude Haiku 4.5
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On November 16, 2025, "claude-haiku-4.5" became available as a model option in Amazon Q Developer.
I had the opportunity to try the Claude Haiku 4.5 model with Amazon Q CLI and VScode extension (AWS IDE Extensions for VScode), so I'd like to introduce it.
CLI
I used Q CLI version 1.19.6.
$ q --version
q 1.19.6
Changing Models
"claude-haiku-4.5" is now selectable in the "/model" model selection.
> /model
? Select a model for this chat session ›
claude-sonnet-4.5
claude-sonnet-4
❯ claude-haiku-4.5 (active)
4.5 (active)
Using claude-haiku-4.5
Changing Default Model
I tried changing the Q CLI startup default model from Sonnet 4 to Haiku 4.5.
q settings chat.defaultModel "claude-haiku-4.5"
$ q settings chat.defaultModel "claude-haiku-4.5"
$ q
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⠀⠀⠀⣾⡿⢻⣿⡆⠀⠀⠀⢀⣄⡄⢀⣠⣤⣤⡀⢀⣠⣤⣤⡀⠀⠀⢀⣠⣤⣤⣤⣄⠀⠀⢀⣤⣤⣤⣤⣤⣤⡀⠀⠀⣀⣤⣤⣤⣀⠀⠀⠀⢠⣤⡀⣀⣤⣤⣄⡀⠀⠀⠀⠀⠀⠀⢠⣿⣿⠋⠀⠀⠀⠙⣿⣿⡆
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⠀⢰⣿⣿⣤⣤⣼⣿⣷⠀⠀⢸⣿⣿⠀⠀⠀⣿⣿⠀⠀⠀⣿⣿⠀⠀⢀⣴⣶⣶⣶⣿⣿⠀⠀⠀⣠⣾⡿⠋⠀⠀⢸⣿⣿⠀⠀⠀⣿⣿⡇⠀⢸⣿⡇⠀⠀⢸⣿⣿⠀⠀⠀⠀⠀⠀⢹⣿⣇⠀⠀⠀⠀⠀⢸⣿⡿
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⠚⠛⠋⠀⠀⠀⠀⠘⠛⠛⠀⠘⠛⠛⠀⠀⠀⠛⠛⠀⠀⠀⠛⠛⠀⠀⠙⠻⠿⠟⠋⠛⠛⠀⠘⠛⠛⠛⠛⠛⠛⠃⠀⠈⠛⠿⠿⠿⠛⠁⠀⠀⠘⠛⠃⠀⠀⠘⠛⠛⠀⠀⠀⠀⠀⠀⠀⠀⠙⠛⠿⢿⣿⣿⣋⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠛⠿⢿⡧
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│ Set a default model by running q settings chat.defaultModel MODEL. │
│ Run /model to learn more. │
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🤖 You are chatting with claude-haiku-4.5
The chat started with "claude-haiku-4.5" as the initial model.
AWS IDE Extensions for VScode
The VScode extension also allows specifying Haiku 4.5 as a model.
Version
I used 1.104.0 from 2025-11-15.
Model Selection
Claude Sonnet 4 was set as the default.
Sonnet 4.5 and Haiku 4.5 are now available for selection.
Summary
Claude Haiku 4.5 is described as lightweight and fast while having performance comparable to Sonnet 4.
As of November 17, there was no information on the cost of using the Haiku 4.5 model with Q Developer on the official pricing page.
In Amazon Bedrock pricing, Haiku 4.5 token pricing is 1/3 of Sonnet 4.5.
| Model | Price per 1,000 input tokens | Price per 1,000 output tokens |
|---|---|---|
| Claude Haiku 4.5 | USD 0.001 | USD 0.005 |
| Claude Sonnet 4.5 | USD 0.003 | USD 0.015 |
Also, according to a post on X (formerly Twitter) by KIRO, an AI development tool available on AWS, Haiku 4.5 can be used for 0.4 times the credits of Auto (default), suggesting that cost-effective usage can be expected with Q Developer as well.
- Credit coefficients by model in Kiro:
- Auto: 1x credit
- Claude Sonnet 4.5: 1.3x credit
- Claude Sonnet 4: 1.3x credit
- Claude Haiku 4.5: 0.4x credit
When using Q Developer, try Claude Haiku 4.5 if you prioritize response speed and cost, or Claude Sonnet 4.5 if you prioritize accuracy.
