OSS / CI-native LLM evals
Run prompt evals and red teams in CI without paying for a hosted eval SaaS.
At a glance — Oct 2026
Updated 2026-10-27 · forward this page: /jtbds/oss-evals#briefScores as of 2026-10-19 (8 days old).
- Depot Pick
- Promptfoo · 8.43/10 for this job (curated estimate, high confidence)
pricePerf + privacy of local runs; Promptfoo wins general OSS+redteam.
- Runner-up
- Ragas · 8.29/10
Scores higher than the pick on: Price / performance, Privacy / data retention, Lock-in risk (higher = worse).
- When not to use the pick
- Need hosted collaboration/datasets for PMs — Braintrust; RAG-only metrics — Ragas.
- Lock-in / migration
- Runner-up Ragas has lower stored lock-in risk (2 vs 2.5, 0–10, higher = more lock-in). Pick exit signals: open source (provider tag `oss`). Self-host fallback listed for this job: Promptfoo, Inspect AI, SWE-bench.
- Sourced price (no comparable unit)
Pick: no sourced price in this job's unit (no_sourced_price).
No cheapest SKU (no_comparable_unit_for_job). No price was invented.
- Free option
- Failure modes to watch
- Benchmark protocol mismatch: Store assisted-or-not, subset, and harness version beside every cited score. Refuse a ranking that mixes those fields.
- Eval contamination: Keep gold labels out of the agent prompt. Store the harness version beside the score. Do not compare a number across a benchmark revision without saying the revision changed.
- Inter-agent misalignment: Log the assigned subtask next to the worker's stated result. The lead rejects a result that does not match the assignment.
- Non-determinism: Run the task more than once and compare the end state, not a single transcript. Record the trial count next to any success rate you cite.
- Observability gap: Alert on a drop in trace ingestion and on certificate expiry for the trace host. Do not treat a missing trace as a successful quiet run.
- Weak verification: Success requires an end-state check the agent does not grade for itself: tests, a database diff, or a separate judge that cannot see the gold label.
Cite: Agent Provider Depot, Depot Pick for oss-evals: promptfoo, scores as of 2026-10-19. Agents: GET /api/decide?jtbd=oss-evals
Free OSS / CI-native LLM evals options · for eval-judge agents
Promptfoo
pricePerf + privacy of local runs; Promptfoo wins general OSS+redteam.
Pricing (directional): As of 2026-10-24 (promptfoo.dev/pricing, fetched 2026-10-24): Community 'Free Forever' ('Our open-source tool, perfect for individual developers and small teams.') with 'Red teaming (10k probes/month)' and 'Run locally or self-host on your …
Lock-in risk: higher = more lock-in (worse). Overall already inverts this dimension.
Default OSS eval harness. Braintrust when you want hosted collaboration; Promptfoo when you want local/CI control.
Quote for OSS / CI-native LLM evals
Depot Pick stays Promptfoo. Prices below are sourced SKU rows only (as of 2026-10-27). Input and output are not blended. GET /api/quote?jtbd=oss-evals
Nothing was compared. no comparable sourced unit for this job; chat input $/1M and other units were not borrowed pickIsPriceWinner is null.
Sourced price unavailable for the Depot Pick. No row in the pricing index.
7 of 7 candidates have no sourced price row. 7 are excluded from the Matching price comparison (none). no comparable sourced unit for this job; chat input $/1M and other units were not borrowed
Runners-up
Ragas
Default RAG metric library. Pair with Promptfoo/Braintrust for broader agent evals.
Braintrust
Depot pick when evals are the product quality gate. Pair with Helicone/Langfuse for cheap request logs if…
LangSmith
If you live in LangGraph, LangSmith is the obvious observatory. Otherwise compare Langfuse/Helicone first.
Confident AI
Best when your team already thinks in pytest/DeepEval. Braintrust remains Depot hosted-evals default…
Comet Opik
Pick when you already live in Comet or want OSS Opik + optional cloud. Langfuse remains cheaper OSS default…
LangWatch
Strong when you need multi-turn/voice agent simulations with EU self-host. Langfuse default tracing…
When NOT to use the top pick
Need hosted collaboration/datasets for PMs — Braintrust; RAG-only metrics — Ragas.
Full ranking (score table)
Ranked with this JTBD's weights. Scores are curated estimates unless marked otherwise. Agents: prefer /api/decide then this table for tie-breaks.
| # | Provider | Overall | Fit | $/perf | Latency | DX | As of |
|---|---|---|---|---|---|---|---|
| 1 | PromptfooDepot Pick | 8.4 | 8.2 | 9.2 | 7.8 | 8.8 | 2026-10-19 |
| 2 | Ragas | 8.3 | 8.0 | 9.5 | 7.5 | 8.2 | 2026-09-14 |
| 3 | Braintrust | 8.3 | 9.2 | 7.5 | 8.6 | 8.8 | 2026-10-19 |
| 4 | LangSmith | 8.1 | 9.0 | 7.0 | 8.8 | 9.0 | 2026-09-14 |
| 5 | LangWatch | 8.1 | 8.4 | 8.0 | 8.0 | 8.6 | 2026-09-14 |
| 6 | Confident AI | 8.1 | 8.6 | 7.8 | 8.0 | 9.0 | 2026-09-14 |
| 7 | Comet Opik | 8.0 | 8.2 | 8.5 | 8.0 | 8.4 | 2026-09-14 |
Score methodology for this job
pricePerf + privacy of local runs; Promptfoo wins general OSS+redteam.
capabilityFit: 26%pricePerformance: 12%latencyReliability: 12%developerDx: 22%privacyPosture: 12%lockInRisk: 8%maturity: 8%