benchr
AI model deprecation tracker
Announced retirements, confirmed sunset dates, and one-line migration paths — verified against each provider's official deprecation documentation. Migrate before the sunset date to avoid broken workloads.
No models match these filters.
Announced & confirmed sunsets
| Model | Provider | Status | Sunset date | Migrate to | Source |
|---|---|---|---|---|---|
| Claude Sonnet 4 | Anthropic | Retiring | Jun 15, 2026 | Claude Sonnet 4.6 — same $3/$15 pricing, 1M context. Swap model id before the date; calls fail after retirement. Migration guide. | platform.claude.com/docs |
| Claude Opus 4 | Anthropic | Retiring | Jun 15, 2026 | Claude Opus 4.8 — three times cheaper ($5/$25 vs $15/$75) and far stronger. Swap model id. Migration guide. | platform.claude.com/docs |
| Claude Opus 4.1 | Anthropic | Deprecated | Aug 5, 2026 | Claude Opus 4.8 — cheaper and stronger across the board. Migration guide. | platform.claude.com/docs |
| GPT-5.3 Instant (ChatGPT) | OpenAI | Phasing out | ~Aug 2026 | GPT-5.5 Instant — already the ChatGPT default since May 5; paid users keep 5.3 Instant roughly three months from that date. | help.openai.com release notes |
| Gemini 3 Pro | Sunset | Mar 9, 2026 | Gemini 3.1 Pro — same pricing tier, improved reasoning. Drop-in API swap. (Vertex AI listed it discontinued by Mar 26.) | ai.google.dev/deprecation | |
| Claude Mythos Preview | Anthropic | Deprecated | Jun 30, 2026 | Claude Mythos 5 inside Project Glasswing. General developers: Claude Fable 5 is the public Mythos-class model. | platform.claude.com/docs |
| deepseek-chat / deepseek-reasoner | DeepSeek | Deprecated | Jul 24, 2026 | DeepSeek V4-Flash / V4-Pro — alias rename only, no pricing or capability change. Swap to the explicit versioned model names before the date. | api-docs.deepseek.com |
| Claude Opus 4.7 fast mode | Anthropic | Deprecated | Jul 24, 2026 | Claude Opus 4.8 fast mode or Opus 4.7 standard mode. Fast mode removal only; base Opus 4.7 remains available. | platform.claude.com/docs |
| Gemini 3 Pro Image Preview | Deprecated | Jun 25, 2026 | Gemini 3 Pro Image (stable) — drop-in id swap; the stable release replaced the preview. | ai.google.dev/deprecation | |
| Codex models, deep-research, computer-use-preview | OpenAI | Deprecated | Jul 23, 2026 | GPT-5.5 (Codex), GPT-5.5 Pro (deep-research), GPT-5.4 mini (computer use, codex-mini). Wave breakdown. | developers.openai.com/api/docs/deprecations |
| Gemini 2.5 Pro + 2.5 Flash | Deprecated | Oct 16, 2026 | Gemini 3.1 Pro / Gemini 3.5 Flash — both raise list prices; Flash input jumps 5×. Migration guide. | ai.google.dev/deprecation | |
| GPT-4o (2024-05-13) | OpenAI | Deprecated | Oct 23, 2026 | GPT-5.5 is OpenAI's pick; GPT-5 is the cost match for most 4o traffic. Migration guide. | developers.openai.com/api/docs/deprecations |
| GPT-4, GPT-4 Turbo, GPT-3.5, GPT-4.1 nano, GPT Image 1, o1/o3-mini/o4-mini | OpenAI | Deprecated | Oct 23, 2026 | GPT-5.5 / GPT-5.4 mini per OpenAI. Eleven model IDs go the same day. Full wave breakdown. | developers.openai.com/api/docs/deprecations |
| Prompts API · Evals · Agent Builder | OpenAI | Deprecated | Nov 30, 2026 | Platform products, not models (announced June 3, 2026). Agent Builder's official path is the Agents SDK; prompts move into application code. | developers.openai.com/api/docs/deprecations |
| Older GPT-5 / o3 snapshots | OpenAI | Deprecated | Dec 11, 2026 | Dated snapshots only (gpt-5-2025-08-07, o3-2025-04-16, …) — the floating gpt-5 / gpt-5-mini / gpt-5-nano aliases stay live. Per-id replacements: GPT-5.5 / GPT-5.4 mini / GPT-5.4 nano / GPT-5.5 Pro. Announced June 11, 2026. | developers.openai.com/api/docs/deprecations |
| Claude 3 Opus | Anthropic | Retired | Jan 5, 2026 | Claude Opus 4.8 — Anthropic's listed replacement. Calls to claude-3-opus now fail. | platform.claude.com/docs |
| Claude 3.5 Haiku | Anthropic | Retired | Feb 19, 2026 | Claude Haiku 4.5 — same pricing tier, better capability. Retired alongside Claude Sonnet 3.7. | platform.claude.com/docs |
| Gemini 1.0 Pro | Sunset | Apr 9, 2026 | Gemini 3.1 Pro or Gemini 3.5 Flash depending on quality/cost needs. | ai.google.dev/deprecation |
Need the full story on any of these? The deprecations hub keeps the permanent record — every retirement with its price delta, benchmark delta, and migration guide, plus an RSS feed for new announcements. Calls to a retired ID already failing? The API error database covers the 404s and the fixes.
Active models (no announced sunset)
These models are fully supported as of June 2026 with no announced end-of-life. Still, model generations move fast — follow the benchr dispatch below (RSS) to hear about changes same-day.
| Model | Provider | Status | Notes |
|---|---|---|---|
| Claude Opus 4.8 | Anthropic | Active | Released May 28, 2026. Current flagship. |
| Claude Opus 4.7 | Anthropic | Active | Superseded by 4.8 but still supported. |
| Claude Sonnet 4.6 | Anthropic | Active | Current mid-tier workhorse. |
| Claude Haiku 4.5 | Anthropic | Active | Current small/fast tier. |
| GPT-5.5 | OpenAI | Active | Latest OpenAI flagship (Apr 2026). |
| GPT-5 | OpenAI | Active | Launched Aug 2025. Main production model. |
| GPT-5 Mini | OpenAI | Active | Small/cheap tier. |
| Gemini 3.5 Flash | Active | GA since May 19, 2026. | |
| Gemini 3.1 Pro | Active | Preview. Replacement for Gemini 3 Pro. | |
| Grok 4.3 | xAI | Active | Current xAI flagship. |
| DeepSeek V4-Pro / Flash | DeepSeek | Active | MIT license. Self-hosted or API. |
| Kimi K2.6 | Moonshot AI | Active | Modified MIT. |
| Mistral Large 3 | Mistral | Active | Apache 2.0. Dec 2025. |
| Llama 4 Scout / Maverick | Meta | Active | Community license. Self-host. |
| Qwen 3.6 | Alibaba | Active | Apache 2.0. |
| Phi-4 | Microsoft | Active | MIT. Edge/local use. |
How to migrate safely
Model migrations are usually a one-line API change — swap the model ID in your request. The harder part is verifying that outputs haven't regressed. Here's the process benchr recommends:
- Read the provider's official migration guide — they almost always include context-window and capability notes.
- Run your top 10 prompt templates against both the old and new model. Compare outputs.
- Check for prompt-length changes — newer models sometimes handle system prompts differently.
- Update your model ID in staging first; test for at least 48 hours before production.
- Monitor cost — newer models often have different pricing even at the "same tier."
Need to quickly compare the old and new model? Use the side-by-side compare tool.
Frequently asked questions
What is model deprecation?
When a provider announces that a model version will stop accepting API calls after a specific date. Usually they give 30–90 days notice and suggest a successor model. After the sunset date, calls to that model ID will fail or redirect.
How much notice do providers give?
It varies. Anthropic and OpenAI typically give 30–90 days notice. Google has used 30-day windows. Some smaller providers give less. The benchr dispatch covers these announcements same-day — subscribe via the RSS feed below.
Is Gemini 3 Pro still accessible?
No — Gemini 3 Pro Preview was shut down March 9, 2026 on the Gemini API (Vertex AI listed it discontinued by March 26). Migrate to Gemini 3.1 Pro (same pricing, better reasoning) or Gemini 3.5 Flash (faster, cheaper, with a free tier).