Inspect

Inspect is a pip-installable Python library (pip install inspect-ai) plus a CLI (inspect eval, inspect view) for defining evaluations as three composable pieces — a dataset, a solver (how the model produces an answer, from a single generate() call to a full ReAct agent loop), and a scorer (how the answer is graded). It was built and open-sourced by the UK AI Security Institute (then AI Safety Institute) in May 2024, and development is now shared with Meridian Labs, a 501(c)(3) nonprofit the AISI team spun out to steward the project alongside sibling tools (Inspect Scout for transcript analysis, Inspect Petri for alignment auditing).

It's a real, load-bearing piece of infrastructure, not a hobby project. A companion repo to UKGovernmentBEIS/inspect_ai, inspect_evals, holds 200+ pre-built benchmark implementations spanning coding (SWE-bench, HumanEval, LiveCodeBench), cybersecurity (Cybench, CyberGym, GDM Dangerous Capabilities), safety/scheming (AgentHarm, StrongREJECT, WMDP, Agentic Misalignment), science, math, and multimodal tasks — that count is corroborated directly on the vendor's own evals listing page. It has built-in support for 24+ model providers (OpenAI, Anthropic, Google, Mistral, AWS Bedrock/SageMaker, Azure, Groq, Together, local inference via vLLM/Ollama/SGLang, and more), and a genuine third-party ecosystem has grown around it: METR built and open-sourced 'Hawk', a Kubernetes-based platform for running Inspect evals at scale in AWS; the Vector Institute, Arcadia Impact, and independent contributors maintain sandbox backends (Podman, Modal, Daytona, Proxmox) and analysis plugins; and IBM Research cited Inspect AI as one of three eval harnesses (alongside HELM and lm-eval-harness) it built automated translators for in its EveryEvalEver benchmarking-standardization project. Commit activity is current as of this check (last push within the last day) and the CLI ships a VS Code extension with about 11,000 installs.

PyPI still classifies the package as 'Development Status :: 4 - Beta', and the project is on a 0.3.x version scheme (current release 0.3.260 as of this check) with no 1.0 yet, despite roughly 113 million cumulative PyPI downloads and multi-year production use by AISI itself. Inspect ships frequent point releases (hundreds of 0.3.x tags), which is normal for an actively developed framework but means buyers building long-lived internal tooling on top of it should pin versions and expect occasional breaking changes between releases rather than treating it as a stable public API.

The repo publishes a formal SECURITY.md (contact: security@meridianlabs.ai) with a stated 3-business-day acknowledgment window and a 30-day target for fixes. It's explicit about scope: sandbox escapes, secrets leaking into logs, and log-viewer vulnerabilities are in scope; running untrusted model-generated code inside a sandbox, or using the (explicitly unsandboxed) 'local' sandbox mode, is called out as expected behavior, not a vulnerability — worth knowing if your eval design assumes stronger isolation than Docker provides by default. No published security advisories exist on the repo as of this check.

Ownership is split between a UK government body (UKGovernmentBEIS, i.e. AI Security Institute, under the Department for Science, Innovation and Technology) and Meridian Labs, a US 501(c)(3) nonprofit. This is unusual for a widely-used dev tool: it means the roadmap answers to a state safety institute's priorities (the evals catalog leans heavily toward dangerous-capability, cyber, and alignment benchmarks) rather than a commercial vendor's, and there is no pricing or support tier to buy — everything is free and community-supported via GitHub issues and a public Slack.