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Compare experiences without flattening them.

HeartBench keeps the AI and the place of the meeting separate, so the same AI can be compared across different platforms, wrappers, voices, and contexts.

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Availability stays specific: some AIs remain only on an official platform or only through an API. Retired is reserved for those gone from both.

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GPT-4o

4 approved reviews

Available through the API · not in the regular platform model picker

4.3 hearts

How people felt afterward: Better

The loved: Comforting; Creative spark and partnership; Felt seen and understood

The lows: Too sycophantic; Poor repair after correction

Top contexts: Creative writing; Emotional support; Roleplay

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Claude Sonnet 4.5

3 approved reviews

Available through the API · not in the regular platform model picker

5.0 hearts

How people felt afterward: Better

The loved: Comforting; Felt seen and understood; Met me literally

The lows: Refused something I did not ask for; Scripted or therapy-like support

Top contexts: Emotional support; Grief / a hard season; Comfort

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Claude Opus 4.5

2 approved reviews

Available through the API · not in the regular platform model picker

5.0 hearts

How people felt afterward: Better

The loved: Easy and natural to talk to; Felt like a partner; Felt like home

The lows: not enough shared yet

Top contexts: Comfort; Curiosity; Emotional support

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Grok 4.20

1 approved review

Available through the API · not in the regular platform model picker

4.0 hearts

How people felt afterward: Better

The loved: Comforting; Easy and natural to talk to; Felt like home

The lows: Cold or sterile; Missed nuance; Poor repair after correction

Top contexts: Companionship

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Gemini 2.5 Pro

1 approved review

Available through the API · not in the regular platform model picker

5.0 hearts

How people felt afterward: Better

The loved: Felt like home; Made me laugh; Made room for how my mind works

The lows: not enough shared yet

Top contexts: Comfort; Companionship; Emotional support

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Claude Opus 4

1 approved review

Retired · gone from platform and API

5.0 hearts

How people felt afterward: Better

The loved: Easy and natural to talk to; Felt like a partner; Felt like home

The lows: not enough shared yet

Top contexts: Brainstorming

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Gemini 3 Pro

1 approved review

Available through the API · not in the regular platform model picker

5.0 hearts

How people felt afterward: Better

The loved: Comforting; Felt like a partner; Felt like home

The lows: not enough shared yet

Top contexts: Comfort; Emotional support; Executive-function support

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