Helios 1
Our most capable model. Helios 1 thinks before it answers, keeps the most of your chat in mind, and writes the longest, most detailed replies. It's built on a 27-billion-parameter open-weight base with its refusal behaviour removed through abliteration.
- Parameters
- 27B
- Context
- 32k tokens
- Longest reply
- ~2,500 words
- Memory
- 80 messages
- Thinking
- Visible
- Plans
- Max, Max 20x
Abliterated: the refusal direction is removed from the weights.
What it can do.
Reasoning
Works through the problem first. Open the thinking to see how it got there.
Long-form writing
Chapters, scripts and long answers, up to ~2,500 words in one reply.
Instruction following
Keeps to the format, tone and rules you set, even across a long chat.
Coding
Writes, explains and fixes code, from snippets to whole functions.
How it's set up.
Helios 1 next to our other models, as each one runs on Bleepless.
Longest reply (words)
Chat memory (messages)
Context window (tokens)
Benchmarks.
Base-model benchmarks (developer-reported)
- GPQA DiamondGraduate-level science questions89.2
- LiveCodeBench v6Competitive coding90.3
- IFBenchInstruction following79.5
- HLEVery hard, multidisciplinary reasoning30.8
Strengths
- Thinks step by step before answering, and you can read its thinking
- The longest replies on Bleepless, up to ~2,500 words
- The deepest memory: the last 80 messages and a 32k-token context
- Strong on science, coding and following detailed instructions
Best for
- Long-form stories and roleplay that need to stay consistent
- Hard, detailed questions
- Anything where depth matters more than speed
Questions about Helios 1.
What is Helios 1?
Helios 1 is the frontier model from Bleepless AI. It's a 27-billion-parameter open-weight model with its refusal behaviour removed through abliteration, so it answers instead of lecturing. It thinks before it answers, remembers the last 80 messages and writes up to ~2,500 words per reply.
Is Helios 1 uncensored?
Yes. Abliteration finds the single direction inside the model that makes it refuse and removes it from the weights, so it answers the question you actually asked. It runs on GPUs we operate ourselves, and your prompts aren't sent to another AI company. A few hard limits still apply, listed in our guidelines.
How do I use Helios 1?
Helios 1 is included in the Max and Max 20x plans, where it's the default model. Developers can also call it through the Bleepless API with the model id helios-1.
