NLP Lineage

7 April 2026 · Agents

Project Glasswing

Project Glasswing

Anthropic

Date
7 April 2026
What the date marks
Announcement
Kind
Policy event
Organisation
Anthropic
Access
gated research preview
Other dates
update 2026-06-02
Threads
In the guided tour
Chapter 14. Where the threads meet now
Learning phases
7. Agents

A milestone: 1 later milestone descends directly from it, and its descendants reach 2 of the 10 threads. How levels are decided

Figures quoted here are reported by the organisation that built it, not independently verified.

Read the primary source (anthropic.com)

Full summary in progress. Until then, this page shows the milestone's record from the research data.

What it changed

Before it

Frontier models were released either publicly or not at all.

The problem

A model strong enough to help defenders in cybersecurity is also strong enough to help attackers.

What it introduced

A gated consortium giving a small number of trusted organisations access to a model not offered publicly.

Why it matters

It established a middle path between open release and no release, for capabilities considered too sensitive for general availability.

What modern models inherit

Tiered, vetted access as a release mode for sensitive capability.

What came next

The Mythos and Fable releases in June, and the export-control episode that followed.

Before and after

The milestones it descends from, and the milestones that descend from it. Work developed alongside it is not counted. Weak links are left out unless you include them.

Before: where it came from

No documented ancestors are recorded for Project Glasswing without weak links.

No documented ancestors are recorded for Project Glasswing without weak links.

Project Glasswing has 53 recorded ancestors, including indirect ones, across 11 chapters, reaching back to Recurrent networks in 1990. Showing its direct parents and the 17 turning points among them.

Project Glasswing has 53 recorded ancestors, including indirect ones, across 11 chapters, reaching back to Recurrent networks in 1990. Showing all of them.

  1. 2026Project GlasswingThis milestone.
  2. 2024Computer useProject Glasswing was influenced by this (indirect influence)Chapter 13. Models that act
  3. 2024Claude 3.5 SonnetComputer use built directly on thisChapter 14. Where the threads meet now
  4. 2024Claude 3Claude 3.5 Sonnet built directly on thisChapter 14. Where the threads meet now
  5. 2023GPT-4VComputer use was influenced by thisChapter 11. Seeing and hearing
  6. 2023Function callingComputer use was influenced by this (indirect influence)Chapter 13. Models that act
  7. 2023GPT-4 Turning pointGPT-4V built directly on thisChapter 7. The assistant goes public
  8. 2023ClaudeClaude 3 built directly on thisChapter 7. The assistant goes public
  9. 2023ToolformerFunction calling was influenced by this (indirect influence)Chapter 13. Models that act
  10. 2022Constitutional AIClaude 3 built directly on thisChapter 6. Teaching models what people want
  11. 2022GPT-3.5 Turning pointGPT-4 succeeded thisChapter 7. The assistant goes public
  12. 2022ReActFunction calling was influenced by this (indirect influence)Chapter 13. Models that act
  13. 2022HH-RLHFConstitutional AI built directly on this
    Claude was influenced by this    Chapter 6. Teaching models what people want
  14. 2022InstructGPT Turning pointGPT-4 built directly on thisChapter 6. Teaching models what people want
  15. 2022Chain of thought Turning pointReAct built directly on thisChapter 12. Thinking longer
  16. 2021WebGPTReAct was influenced by this
    Toolformer was influenced by this    Chapter 13. Models that act
  17. 2021HHH assistantHH-RLHF built directly on thisChapter 6. Teaching models what people want
  18. 2021FLANInstructGPT was influenced by thisChapter 6. Teaching models what people want
  19. 2021CLIPGPT-4V was influenced by this (indirect influence)Chapter 11. Seeing and hearing
  20. 2020Vision TransformerCLIP built directly on thisChapter 11. Seeing and hearing
  21. 2020RLHF for summarisation Turning pointInstructGPT built directly on this
    WebGPT built directly on this    Chapter 6. Teaching models what people want
  22. 2020GPT-3 Turning pointToolformer built directly on thisChapter 5. Scale becomes a science
  23. 2020Scaling laws Turning pointGPT-4 built directly on thisChapter 5. Scale becomes a science
  24. 2019T5 Turning pointFLAN was influenced by thisChapter 4. Pretrain once, use everywhere
  25. 2019C4 Turning pointT5 was influenced by thisChapter 4. Pretrain once, use everywhere
  26. 2019RLHF for LMsRLHF for summarisation built directly on thisChapter 6. Teaching models what people want
  27. 2019Sparse Transformer Turning pointGPT-3 built directly on thisChapter 4. Pretrain once, use everywhere
  28. 2019GPT-2 Turning pointCLIP built directly on thisChapter 4. Pretrain once, use everywhere
  29. 2019WebTextGPT-2 was influenced by thisChapter 4. Pretrain once, use everywhere
  30. 2019Transformer-XLSparse Transformer was influenced by this (indirect influence)Chapter 4. Pretrain once, use everywhere
  31. 2018BERT Turning pointVision Transformer was influenced by thisChapter 4. Pretrain once, use everywhere
  32. 2018SentencePieceT5 built directly on thisChapter 4. Pretrain once, use everywhere
  33. 2018GPT-1GPT-2 built directly on thisChapter 4. Pretrain once, use everywhere
  34. 2018ELMoBERT was influenced by this
    GPT-1 was influenced by this (indirect influence)    Chapter 4. Pretrain once, use everywhere
  35. 2018ULMFiTBERT was influenced by this
    GPT-1 was influenced by this (indirect influence)    Chapter 4. Pretrain once, use everywhere
  36. 2017CoVeELMo was influenced by thisChapter 3. Attention, then only attention
  37. 2017RLHF originConstitutional AI was influenced by thisChapter 6. Teaching models what people want
  38. 2017Transformer Turning pointGPT-2 built directly on this
    Scaling laws built directly on this
    Vision Transformer built directly on this    Chapter 3. Attention, then only attention
  39. 2017ConvS2STransformer was influenced by this (indirect influence)Chapter 3. Attention, then only attention
  40. 2016Layer normGPT-2 built directly on thisChapter 3. Attention, then only attention
  41. 2015Residual connectionsTransformer was influenced by thisChapter 3. Attention, then only attention
  42. 2015LM pretraining Turning pointBERT was influenced by this
    GPT-1 was influenced by this    Chapter 2. Words become vectors
  43. 2015BPE tokenizationGPT-2 built directly on thisChapter 2. Words become vectors
  44. 2015Luong attentionTransformer was influenced by thisChapter 3. Attention, then only attention
  45. 2014AdamTransformer was influenced by thisChapter 2. Words become vectors
  46. 2014GloVeELMo built directly on thisChapter 2. Words become vectors
  47. 2014Seq2seq Turning pointTransformer built directly on thisChapter 2. Words become vectors
  48. 2014Attention Turning pointTransformer built directly on thisChapter 3. Attention, then only attention
  49. 2014GRU / encoder-decoderAttention built directly on thisChapter 2. Words become vectors
  50. 2013word2vecELMo was influenced by thisChapter 2. Words become vectors
  51. 2011NLP from scratchELMo was influenced by thisChapter 1. Language as probability
  52. 2003Neural LMNLP from scratch was influenced by this
    word2vec was influenced by this    Chapter 1. Language as probability
  53. 1997LSTM Turning pointSeq2seq built directly on this
    ELMo built directly on this    Chapter 1. Language as probability
  54. 1990Recurrent networksLSTM was influenced by thisChapter 1. Language as probability

After: what it led to

Project Glasswing has 1 documented descendants across 1 chapter, reaching forward to Fable 5 / Mythos 5 in 2026. Showing all of them.

Project Glasswing has 1 documented descendants across 1 chapter, reaching forward to Fable 5 / Mythos 5 in 2026. Showing all of them.

Project Glasswing has 1 recorded descendants, including indirect ones, across 1 chapter, reaching forward to Fable 5 / Mythos 5 in 2026. Showing all of them.

Project Glasswing has 1 recorded descendants, including indirect ones, across 1 chapter, reaching forward to Fable 5 / Mythos 5 in 2026. Showing all of them.

  1. 2026Project GlasswingThis milestone.
  2. 2026Fable 5 / Mythos 5was influenced by Project GlasswingChapter 14. Where the threads meet now
  1. 2026Project GlasswingThis milestone.
  2. 2026Fable 5 / Mythos 5was influenced by Project GlasswingChapter 14. Where the threads meet now

Direct links and their sources

Where it came from

Influenced by

What it led to

Influenced