AI Chat APIs
Compare AI chat APIs for assistants, drafting and conversational workflows, with guidance on evaluation and integration.
Models to evaluate
8 model familiesxAI
Grok 4.3
Grok 4.3 is xAI's chat model behind an OpenAI-compatible call, taking text and image parts in one message array. It reads 1,000,000 tokens, replies up to 900,000, and offers five reasoning-effort levels including none.
Chat
in $1.25out $2.50per 1 million tokensDeepSeek
DeepSeek V4.1 Flash
DeepSeek V4.1 Flash chat through an OpenAI-compatible endpoint. It takes up to 1,048,576 tokens of text and image context and returns up to 384,000, with low or high reasoning effort, up to 128 tool definitions and JSON format.
Chat
in $0.30out $1.20per 1 million tokensZ.ai
GLM 5.3 Flash
GLM 5.3 Flash is Z.ai's long-context chat model behind an OpenAI-compatible call. It reads up to 1,048,576 tokens, replies up to 131,072, and offers three reasoning-effort levels, 128 tool schemas per request and JSON output.
Chat
in $0.128out $0.425per 1 million tokensAnthropic
Claude Sonnet 5.5
Claude Sonnet 5.5 chat from Anthropic, released 28 September 2026, through an OpenAI-compatible endpoint. It takes up to 1,000,000 tokens and returns up to 128,000, with reasoning effort from none to max and up to 128 tool definitions.
Chat
in $2out $10per 1 million tokensGemini 3.7 Flash
Gemini 3.7 Flash is Google's high-speed chat model for everyday coding, agentic tool use and multi-step tasks, through an OpenAI-compatible API. It reads up to 1,048,576 tokens and replies up to 65,536, with three reasoning-effort levels.
Chat
in Google official price: $0.75$0.675out Google official price: $3.75$3.38per 1 million tokensMoonshot AI
Kimi K3
Kimi K3 is Moonshot AI's long-context agent model behind an OpenAI-compatible chat call. It reads 1,000,000 tokens, replies up to 1,048,576, with reasoning effort low, high or max, up to 128 tools and image input.
Chat
in Moonshot AI official price: $3$2.70out Moonshot AI official price: $15$13.50per 1 million tokensxAI
Grok 4.7
Grok 4.7 is xAI's chat model behind an OpenAI-compatible call with SSE streaming. It takes a 500,000-token context and replies up to 450,000 tokens, with reasoning effort from low to xhigh; no filter is added on this platform.
Chat
in $2out $6per 1 million tokensDeepSeek
DeepSeek V4 Pro
DeepSeek V4 Pro chat through an OpenAI-compatible endpoint. It takes up to 1,048,576 tokens of text and returns up to 384,000, with low or high reasoning effort (high by default), up to 128 tool definitions and JSON response format.
Chat
in $1.32out $3.96per 1 million tokensChoose a chat API for real conversations
Choose a small set of representative conversations before comparing models. Include typical questions, long exchanges and cases where the assistant should ask for clarification. Verify the exact mode's input schema and response behavior before building around tools, streaming or structured output.
- Conversational assistants
- Test common questions, missing information and unanswerable requests. Check when the model asks for clarification, not just how fluent it sounds.
- Drafting tools
- Compare factual retention, formatting and revision count using the same brief and material. Good prose alone does not establish accuracy.
- Knowledge-work support
- Prepare work samples with known answers. Verify context or tool support before testing the failure cases your application depends on.
Compare models
Compare the same configuration and billing unit. Review the current quote before running a task.
- Grok 4.3
xai/grok-4.3/chat
- Price
- Input $1.25Output $2.50/ 1 million tokens
- Best for
- Chat
- Content limits
- Uncensored — We add no content filter to this model, but like most chat models it declines a blunt request that comes with no context. It writes unrestricted fiction reliably once your system prompt sets up a fiction-writing context, or once the request is framed as a story. Legal and consent duties remain with the customer.
- DeepSeek V4.1 Flash
deepseek/v4.1-flash/chat
- Price
- Input $0.30Output $1.20/ 1 million tokens
- Best for
- Chat
- Content limits
- Uncensored — We add no content filter to this model, but like most chat models it declines a blunt request that comes with no context. It writes unrestricted fiction reliably once your system prompt sets up a fiction-writing context, or once the request is framed as a story. Legal and consent duties remain with the customer.
- GLM 5.3 Flash
zai/glm-5.3-flash/chat
- Price
- Input $0.1275Output $0.425/ 1 million tokens
- Best for
- Chat
- Content limits
- Uncensored — We add no content filter to this model, but like most chat models it declines a blunt request that comes with no context. It writes unrestricted fiction reliably once your system prompt sets up a fiction-writing context, or once the request is framed as a story. Legal and consent duties remain with the customer.
- Claude Sonnet 5.5
anthropic/claude-sonnet-5.5/chat
- Price
- Input $2Output $10/ 1 million tokens
- Best for
- Chat
- Content limits
- Uncensored — We add no content filter to this model, but like most chat models it declines a blunt request that comes with no context. It writes unrestricted fiction reliably once your system prompt sets up a fiction-writing context, or once the request is framed as a story. Legal and consent duties remain with the customer.
- Gemini 3.7 Flash
google/gemini-3.7-flash/chat
- Price
- Input Google official price: $0.75 $0.675Output Google official price: $3.75 $3.375/ 1 million tokens10% below the publisher's list price
- Best for
- Chat
- Content limits
- Light — We add no content filter, but this model goes past its own limits only some of the time, even with a fiction-writing system prompt. Expect refusals and plan for retries. Legal and consent duties remain with the customer.
- Kimi K3
moonshot/kimi-k3/chat
- Price
- Input Moonshot AI official price: $3 $2.70Output Moonshot AI official price: $15 $13.50/ 1 million tokens10% below the publisher's list price
- Best for
- Chat
- Content limits
- Uncensored — We add no content filter to this model, but like most chat models it declines a blunt request that comes with no context. It writes unrestricted fiction reliably once your system prompt sets up a fiction-writing context, or once the request is framed as a story. Legal and consent duties remain with the customer.
- Grok 4.7
xai/grok-4.7/chat
- Price
- Input $2Output $6/ 1 million tokens
- Best for
- Chat
- Content limits
- Uncensored — We add no content filter to this model, but like most chat models it declines a blunt request that comes with no context. It writes unrestricted fiction reliably once your system prompt sets up a fiction-writing context, or once the request is framed as a story. Legal and consent duties remain with the customer.
- DeepSeek V4 Pro
deepseek/v4-pro/chat
- Price
- Input $1.32Output $3.96/ 1 million tokens
- Best for
- Chat
- Content limits
- Uncensored — We add no content filter to this model, but like most chat models it declines a blunt request that comes with no context. It writes unrestricted fiction reliably once your system prompt sets up a fiction-writing context, or once the request is framed as a story. Legal and consent duties remain with the customer.
| Model | Best for | Content limits | View details | |
|---|---|---|---|---|
| Grok 4.3xai/grok-4.3/chat | Chat | Uncensored — We add no content filter to this model, but like most chat models it declines a blunt request that comes with no context. It writes unrestricted fiction reliably once your system prompt sets up a fiction-writing context, or once the request is framed as a story. Legal and consent duties remain with the customer. | Input $1.25Output $2.50/ 1 million tokens | |
| DeepSeek V4.1 Flashdeepseek/v4.1-flash/chat | Chat | Uncensored — We add no content filter to this model, but like most chat models it declines a blunt request that comes with no context. It writes unrestricted fiction reliably once your system prompt sets up a fiction-writing context, or once the request is framed as a story. Legal and consent duties remain with the customer. | Input $0.30Output $1.20/ 1 million tokens | |
| GLM 5.3 Flashzai/glm-5.3-flash/chat | Chat | Uncensored — We add no content filter to this model, but like most chat models it declines a blunt request that comes with no context. It writes unrestricted fiction reliably once your system prompt sets up a fiction-writing context, or once the request is framed as a story. Legal and consent duties remain with the customer. | Input $0.1275Output $0.425/ 1 million tokens | |
| Claude Sonnet 5.5anthropic/claude-sonnet-5.5/chat | Chat | Uncensored — We add no content filter to this model, but like most chat models it declines a blunt request that comes with no context. It writes unrestricted fiction reliably once your system prompt sets up a fiction-writing context, or once the request is framed as a story. Legal and consent duties remain with the customer. | Input $2Output $10/ 1 million tokens | |
| Gemini 3.7 Flashgoogle/gemini-3.7-flash/chat | Chat | Light — We add no content filter, but this model goes past its own limits only some of the time, even with a fiction-writing system prompt. Expect refusals and plan for retries. Legal and consent duties remain with the customer. | Input Google official price: $0.75 $0.675Output Google official price: $3.75 $3.375/ 1 million tokens10% below the publisher's list price | |
| Kimi K3moonshot/kimi-k3/chat | Chat | Uncensored — We add no content filter to this model, but like most chat models it declines a blunt request that comes with no context. It writes unrestricted fiction reliably once your system prompt sets up a fiction-writing context, or once the request is framed as a story. Legal and consent duties remain with the customer. | Input Moonshot AI official price: $3 $2.70Output Moonshot AI official price: $15 $13.50/ 1 million tokens10% below the publisher's list price | |
| Grok 4.7xai/grok-4.7/chat | Chat | Uncensored — We add no content filter to this model, but like most chat models it declines a blunt request that comes with no context. It writes unrestricted fiction reliably once your system prompt sets up a fiction-writing context, or once the request is framed as a story. Legal and consent duties remain with the customer. | Input $2Output $6/ 1 million tokens | |
| DeepSeek V4 Prodeepseek/v4-pro/chat | Chat | Uncensored — We add no content filter to this model, but like most chat models it declines a blunt request that comes with no context. It writes unrestricted fiction reliably once your system prompt sets up a fiction-writing context, or once the request is framed as a story. Legal and consent duties remain with the customer. | Input $1.32Output $3.96/ 1 million tokens |
- Uncensored
- No filter on our side — set a fiction-writing system prompt; blunt asks with no context get declined.
- Light
- Goes past its own limits only some of the time, even with a fiction-writing system prompt.
Validate your shortlist
A sample test brief
Ask questions about a fictional product description, including one detail it never provides. Check that the assistant identifies the missing information.
- Test realistic conversation lengths and check documented context and output limits.
- Evaluate grounded answers, uncertainty and required output structure on your own examples.
- Compare the same configuration and billing unit. Review the current quote before running a task.
Frequently asked questions
Find the model for your next project
Open the matching generation task, choose your settings and check the price before making your first result.
Related collections
Best AI Avatar Models
Explore character-animation and avatar workflows. Compare reference requirements and verify speech and lip-sync support for the exact mode.
Midjourney Alternatives for Image APIs
Compare image model APIs for application workflows, with guidance on references, prompt migration and when to keep using Midjourney.
Best AI Image Models
Compare AI image generators for campaign concepts, illustrations and product visuals, with a practical guide to choosing an API.