generated: '2026-07-21'
method: searched
source: https://docs.lightcone.ai/guides/changelog
product_changelog: https://www.tzafon.ai/changelog
scheme: dated entries, newest first; breaking changes and deprecations announced before taking effect
current:
  recommended_model: tzafon.northstar-cua-fast-1.6
  python_sdk: 2.44.1 (tzafon on PyPI)
  typescript_sdk: 0.19.1 (@tzafon/lightcone on npm)
entries:
  - date: '2026-07'
    highlights:
      - Run Northstar locally on a Mac — Northstar CUA Fast 1.6 as MLX 4-bit quantization (Apache 2.0) paired with the MacControlKit Swift package; no API key or network required
      - Continuous learning (preview) — corrective turns captured from traffic, nightly eval-gated self-distillation checkpoints; new tzafon deploy, client.corrections.create, client.learning.* and X-Lightcone-Training header
      - Documentation overhaul — new CLI, Observability, Logins and sessions, Production, Security, Errors, Limits guides + cookbook
    breaking: false
  - date: '2026-06-26'
    highlights:
      - Price drop — northstar-cua-fast input $0.50/M (was $1.00), output $1.50/M (was $5.00)
    breaking: false
  - date: '2026-06-08'
    highlights:
      - Tasks API additions (all optional/additive) — computer_id + on_missing_computer, context, thread_id, start_url, save_session, keep_alive, max_duration_seconds, metadata, idempotency_key
      - Computer responses include environment_id; task SSE streams resumable via Last-Event-ID
    breaking: false
  - date: '2026-06-01'
    highlights:
      - Chat Completions server-side maximum of 4096 output tokens
      - Computer lifetime fields renamed — timeout_seconds/auto_kill deprecated for max_lifetime_seconds/idle_timeout_enabled (Deprecation + Sunset headers)
    breaking: false
  - date: '2026-04-27'
    highlights:
      - tzafon.northstar-medium-alpha available via GET /v1/models; usage grouped by model family
    breaking: false
  - date: '2026-04-13'
    highlights:
      - TypeScript SDK 0.13.0; OpenAPI/Swagger reference matches v2 API shapes (regenerate custom clients)
    breaking: false
  - date: '2026-04-08'
    highlights:
      - 'Breaking: coordinates no longer pre-scaled — API returns raw 0-999 model space (Python SDK 2.35.0, TypeScript SDK 0.8)'
      - New model tzafon.northstar-cua-fast-1.2
    breaking: true
  - date: '2026-03-12'
    highlights:
      - Responses API — multi-turn via previous_response_id, persistent retrievable responses, computer use with OpenAI drop-in compatibility
    breaking: false
  - date: '2026-03-09'
    highlights:
      - Faster session resume from compressed VM snapshots
    breaking: false
deprecation_policy: >-
  Deprecated fields and endpoints keep working through the sunset date
  announced in Deprecation and Sunset response headers and listed on the
  changelog page; beta APIs can change with notice.