@patpcj: Fable-5/Mythos dropped this morning, so we tested it on agentic search - and it’s the new SOTA. The performance gap is …

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model-release agentic-search sota open-weight cost-comparison

Summary

Fable-5/Mythos achieves new SOTA on agentic search but is expensive for self-hosting, while open-weight Harness-1 offers a cost-effective alternative with fewer query restrictions.

Fable-5/Mythos dropped this morning, so we tested it on agentic search - and it’s the new SOTA. The performance gap is real. So why are we still excited about our 20B open Harness-1? • Much cheaper to self-host: estimated ~$0.2 vs $25–$50 / 1M output tokens • No filtered queries in our setup: Harness-1 ran all eval queries, while Fable-5 filtered out ~7% • Open-weight + small enough to actually run, inspect, and build on Open search agents you can actually afford to run at scale are still worth building. Let’s keep cooking.
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Cached at: 06/10/26, 07:47 AM

Fable-5/Mythos dropped this morning, so we tested it on agentic search - and it’s the new SOTA.

The performance gap is real.

So why are we still excited about our 20B open Harness-1?

• Much cheaper to self-host: estimated ~$0.2 vs 25–50 / 1M output tokens • No filtered queries in our setup: Harness-1 ran all eval queries, while Fable-5 filtered out ~7% • Open-weight + small enough to actually run, inspect, and build on

Open search agents you can actually afford to run at scale are still worth building.

Let’s keep cooking.

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