Halfbill Chat
Halfbill Chat is the web chat for Halfbill. Chat with Claude and GPT models in one interface, switch models mid-conversation, attach files and images, and stream responses. It uses its own chat credits or a Chat plan; you can also switch the chat to one of your organizations to spend that balance.
Models
A short, current list instead of a marketplace. Claude models take 200K input tokens and return up to 32K; GPT models take 400K and return up to 128K. Per-token prices live in the model catalogue.
claude-sonnet-5claude-opus-5claude-fable-5claude-haiku-4-5claude-sonnet-4-6claude-opus-4-6claude-opus-4-7claude-opus-4-8gpt-5.5gpt-5.6-terragpt-5.6-solgpt-6-astraWhat it is for
Billing
Without a plan, each message is billed to your prepaid Halfbill credits at the model's per-token price. A Chat plan is a flat monthly fee with a fair-use allowance; past fair use, chat continues from your credits instead of stopping.
$8/month
Claude Sonnet 5, Sonnet 4.6, Haiku 4.5, GPT-5.5 and GPT-5.6 Terra. $32 of chat at vendor prices ($8/mo), thousands of frontier messages a month. Unlimited history.
$14/month
Every model, including Claude Opus 5, Claude Fable 5, GPT-5.6 Sol and GPT-6 Astra. $70 of chat at vendor prices ($14/mo), thousands of frontier messages a month. Files and images in chat.
$20/month
Every model with the most room: $120 of chat at vendor prices ($20/mo), thousands of frontier messages a month, priority when limits are tight.
Prices exclude VAT; VAT is applied at checkout for EU customers. Cancel anytime. See Chat plans or credits, top-up packs and API plans.
Common questions
Halfbill Chat is the web chat for Halfbill, an independent API service that resells Anthropic Claude and OpenAI GPT models at half the vendor list price. Chat uses the same credit balance as the API, or a flat-fee Chat plan.
Claude Sonnet 5, Opus 5, Fable 5, Haiku 4.5, Sonnet 4.6 and Opus 4.6 through 4.8 from Anthropic, and GPT-5.5, GPT-5.6 Terra, GPT-5.6 Sol and GPT-6 Astra from OpenAI. You can switch models mid-conversation without losing context.
Without a plan, each message is billed to your Halfbill credits at the model's per-token price, and $10 of credits buys $20 of chat at vendor prices. With a plan: Chat Basic gives you $32 of chat at vendor prices ($8/mo), thousands of frontier messages a month; Chat Plus $70 of chat at vendor prices ($14/mo), thousands of frontier messages a month; Chat Pro $120 of chat at vendor prices ($20/mo), thousands of frontier messages a month. Past the allowance, chat continues from your credits. Prices exclude VAT.
No. Add credits once and chat pay-as-you-go. A Chat plan is optional and only makes sense if you chat every day.
We buy inference capacity at volume and run a lean, focused platform. No sales team, no free tier, no marketing budget — the savings go into the price.
Conversations are private to your account, and a chat is only visible to others if you explicitly create a read-only share link. Prompts are not stored by default beyond what is needed to serve the request; request metadata is kept for 30 days. Halfbill does not use your conversations to train models.
Halfbill is an independent service and is not affiliated with, endorsed by, or sponsored by OpenAI or Anthropic. Model names are trademarks of their respective owners.
Every Claude and GPT model, one chat.