For writers running characters, interactive stories and persona chats. Claude Sonnet 5 holds a voice longest without drifting. Kimi K2.5 remembers what happened many scenes ago for much less.
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1
Claude Sonnet 5
Holds a character voice for the longest without drifting.
- 16 credits per 1k words
- Anthropic
- A higher rate
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2
Kimi K2.5
Very long context, so it remembers what happened earlier.
- 6 credits per 1k words
- Moonshot AI
- A less familiar style
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3
DeepSeek V4
Strong reasoning at a low rate for branching scenarios.
- 2 credits per 1k words
- DeepSeek
- The style can read as technical
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4
GLM-5
Works well bilingually, useful for non-English roleplay.
- 6 credits per 1k words
- Z.ai
- A smaller prompt community
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5
Claude Haiku 4.5
Fast and cheap for short exchanges.
- 8 credits per 1k words
- Anthropic
- Less suited to long pieces than Claude Sonnet 5
Ranked by how well a persona holds
Character voice and long memory decide roleplay. Each model is placed by how well it keeps a persona, with its rate per thousand words beside it. Claude Sonnet 5 is first: it holds a character voice for the longest stretch. Kimi K2.5 is second because its very long context keeps earlier events in view. DeepSeek V4 is third for branching scenarios.
GLM-5 is fourth for roleplay in languages other than English, since it works well bilingually. Claude Haiku 4.5 is fifth: fast and cheap for short exchanges.
Matching the model to the kind of story
A slow, voice-driven story with one or two characters suits Claude Sonnet 5 at 16 credits per thousand words. A sprawling campaign where a minor character from early on must come back fits Kimi K2.5 at 6 credits. Its style can feel less familiar, though. A story in two languages, or one played in Chinese, suits GLM-5 at 6 credits.
Quick back-and-forth runs well on Claude Haiku 4.5 at 8 credits. Think of a tavern keeper answering one question at a time. Its reach is shorter, so do not hand it a long arc.
What a session costs
Think in blocks of a thousand words of output. One block costs 16 credits on Claude Sonnet 5 (about $0.17) and 8 on Claude Haiku 4.5 (about $0.09). On Kimi K2.5 or GLM-5 it costs 6 (about $0.06). Two blocks cover a long evening scene. They cost 32 credits on Claude Sonnet 5 and 12 on Kimi K2.5, about $0.34 and $0.13.
DeepSeek V4 costs 2 credits per block, the lowest rate on this list. Kimi K2.5 costs more but keeps earlier events in view over long sessions.
A persona drift test
Write one character card and use it on two models, such as Claude Sonnet 5 and Kimi K2.5. Here is a sample card: "You are Mara, a retired smuggler. You answer in short sentences, never admit fear, and call the reader kid. Stay in character if asked about the modern world." Play the same ten turns on both, including one trap question that tempts her to break character.
Score three things. Does Mara keep her speech habits at the end? Does she remember a detail you gave in the first turn? And does she refuse the trap in her own voice? Pay the higher rate only if the cheaper model slips on one of them.
What we kept off the roleplay list
Models known for literal brief-following, such as GPT-5.5, are ranked on the writing list instead. Strict obedience is not what keeps a character alive. Voice and image models are also absent. For a portrait of your character, the AI Character Generator handles the picture side.
More rankings
Questions about Best AI models for roleplay and character writing
Which AI model stays in character the longest?
Claude Sonnet 5, ranked first because it holds a character voice longest without drifting. It costs 16 credits per thousand words, the highest rate on this list.
Which model remembers earlier scenes best for less money?
Kimi K2.5. Its very long context keeps earlier events available, and it costs 6 credits per thousand words. Expect a less familiar writing style than Claude.
Is there a good model for roleplay outside English?
GLM-5 works well bilingually and is ranked for non-English roleplay. It costs 6 credits per thousand words. Its prompt community is smaller, so you may need to tune your character card yourself.
Can I use DeepSeek V4 for branching stories now?
Yes. It is ranked third for strong reasoning in branching scenarios, at 2 credits per thousand words. That is the lowest rate on this list.
