# Endeavor 1.0

> Flower Labs' first Endeavor model, launched September 1, 2026 as a limited preview: a frontier-class generalist for reasoning, coding and long-horizon agent work, run by Flower or inside a customer's own infrastructure.

- Maker: Flower Labs
- Line: Endeavor
- Canonical page: https://ai-tldr.dev/models/endeavor-1-0/
- Updated: 2026-09-01

## In short

Endeavor 1.0 is Flower Labs' first production-ready Endeavor model, introduced on September 1, 2026, four months after Flower's 7B Lizzy model for UK use. Flower calls it a frontier-class generalist with strong reasoning and coding, designed for the long-horizon work carried out by agents.

## Facts

| Fact | Value | Source |
| --- | --- | --- |
| Licence | Proprietary · API only | [1] |
| Released | 1 September 2026 | [2] |

## Sources

1. [Endeavor 1.0 datasheet (PDF)](https://flower.ai/pdfs/models/endeavor_datasheet_082026.pdf)
2. [Flower blog — Introducing Endeavor 1.0](https://flower.ai/blog/2026-09-01-introducing-endeavor-1.0)

## Overview

Endeavor 1.0 is Flower Labs' first production-ready Endeavor model, introduced on September 1, 2026, four months after Flower's 7B Lizzy model for UK use. Flower calls it a frontier-class generalist with strong reasoning and coding, designed for the long-horizon work carried out by agents. It launched as a preview for a select group of organizations and partners rather than as open self-service access.

Flower's launch evaluation gives it 92.0 on GPQA, 98.2 on HumanEval, 99.9 on AIME 2026 and 94.1 on IFEval. In the same comparison GPT-5.6 Sol scores 94.1, 95.1, 99.9 and 95.9, and Claude Fable 5 92.6, 97.0, 99.9 and 91.7: Endeavor 1.0 has the highest HumanEval score, matches both on AIME 2026, beats Kimi K3 on three of the four benchmarks and Nemotron 3 Ultra on all four. These are vendor-reported figures.

Flower says Endeavor builds on capabilities from the open-weight ecosystem plus its own work, and that much of the effort went into how the model works with its harness: how it allocates reasoning effort, builds and keeps context, uses tools and recovers when a step fails. Its evaluation design also draws on FlowerBench, Flower's benchmark of long-horizon enterprise tasks run inside participating organizations' own environments. The model is offered as a production service operated by Flower or deployed inside an organization's own infrastructure, and a team can mix the two.

Endeavor 1.1 followed on November 3, 2026, adding image input and EU-located inference.

## Benchmarks

- GPQA: 92% ([source](https://flower.ai/blog/2026-09-01-introducing-endeavor-1.0))
- HumanEval: 98.2% ([source](https://flower.ai/blog/2026-09-01-introducing-endeavor-1.0))
- AIME 2026: 99.9% ([source](https://flower.ai/blog/2026-09-01-introducing-endeavor-1.0))
- IFEval: 94.1% ([source](https://flower.ai/blog/2026-09-01-introducing-endeavor-1.0))

## Strengths

- 98.2 on HumanEval, the top score in Flower's launch comparison
- 99.9 on AIME 2026, level with GPT-5.6 Sol and Claude Fable 5 in that comparison
- 92.0 on GPQA and 94.1 on IFEval
- Runs as a Flower-managed service or inside an organization's own infrastructure
- Harness work on reasoning effort, context handling, tool use and error recovery for long-running agents

## Best for

- Reach for Endeavor 1.0 as the core generalist behind agents and complex workflows that must be deployable in your own environment.
- Reach for it when some sensitive applications must run privately while the rest use a managed service.
- Look elsewhere when you need image input: that arrived with Endeavor 1.1.

## Endeavor versions

- [Endeavor 1.1](https://ai-tldr.dev/models/endeavor-1-1/) (3 November 2026): Image input, EU inference, GPQA 94.4 and HumanEval 99.9
- Endeavor 1.0 (1 September 2026): First Endeavor release, a limited preview — this page

## FAQ

### What is Endeavor 1.0?

Flower Labs' first production-ready Endeavor model, launched September 1, 2026 as a limited preview: a frontier-class generalist for reasoning, coding and agent work.

### How did it score?

Flower reports 92.0 on GPQA, 98.2 on HumanEval, 99.9 on AIME 2026 and 94.1 on IFEval, the top HumanEval score in its comparison with GPT-5.6 Sol, Claude Fable 5, Kimi K3 and Nemotron 3 Ultra.

### How can it be deployed?

As a production service operated by Flower, or inside an organization's own infrastructure with Flower's support; teams can use both side by side.

### What came after it?

Endeavor 1.1, released November 3, 2026, with image input, EU-located inference and higher GPQA and HumanEval scores.

## Links

- [Flower blog — Introducing Endeavor 1.0](https://flower.ai/blog/2026-09-01-introducing-endeavor-1.0)
- [Flower — Endeavor model page](https://flower.ai/models/endeavor)
- [Endeavor 1.0 datasheet (PDF)](https://flower.ai/pdfs/models/endeavor_datasheet_082026.pdf)
- [Flower blog — Introducing Endeavor 1.1](https://flower.ai/blog/2026-11-03-introducing-endeavor-1.1)

Source: AI/TLDR LLM registry, https://ai-tldr.dev/models/endeavor-1-0/