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Claude

Anthropic · 22 tracked releases · March 14, 2023 – October 7, 2026

At a glance

Releases tracked22
First trackedMarch 14, 2023 — Claude 1
LatestOctober 7, 2026 — Claude Haiku 5.5
Span1,303 days
Median gap39 days between releases
WeightsProprietary throughout
Record quality15 of 22 verified · how this is judged

Release cadence

One tile per tracked release, placed in the month it shipped, so the pauses in this line are the pauses in the data. Years with nothing tracked keep their row.

  1. 2023
    1. Claude 1, Anthropic, March 14, 2023
    2. Claude 2, Anthropic, July 11, 2023
    2
  2. 2024
    1. Claude 3 Opus, Anthropic, March 4, 2024
    2. Claude 3.5 Sonnet, Anthropic, June 21, 2024
    2
  3. 2025
    1. Claude 3.7 Sonnet, Anthropic, February 24, 2025
    2. Claude Opus 4, Anthropic, May 22, 2025
    3. Claude Sonnet 4.5, Anthropic, September 29, 2025
    4. Claude Haiku 4.5, Anthropic, October 15, 2025
    5. Claude Opus 4.5, Anthropic, November 24, 2025
    5
  4. 2026
    1. Claude Opus 4.6, Anthropic, February 5, 2026Claude Sonnet 4.6, Anthropic, February 17, 2026
    2. Claude Opus 4.7, Anthropic, April 16, 2026
    3. Claude Opus 4.8, Anthropic, May 28, 2026
    4. Claude Fable 5, Anthropic, June 9, 2026Claude Mythos 5, Anthropic, June 9, 2026Claude Sonnet 5, Anthropic, June 30, 2026
    5. Claude Opus 5, Anthropic, July 24, 2026
    6. Claude Fable 5.1, Anthropic, September 1, 2026Claude Mythos 5.1, Anthropic, September 1, 2026Claude Opus 5.5, Anthropic, September 22, 2026Claude Sonnet 5.5, Anthropic, September 28, 2026
    7. Claude Haiku 5.5, Anthropic, October 7, 2026
    13

Lineage

Ordered by announcement date, and spaced by the gap between releases, so a quiet year looks like one. Lineage is not inferred from version numbers — labs do not number consistently, so the dates decide the order.

  1. Claude 1Text in and out

    coding

  2. +119 days

    Claude 2Text in and out

    from Claude 1 Context window 9K → 100K

  3. +237 days

    Claude 3 OpusText in and outImage input

    visionstructured output

  4. +109 days

    Claude 3.5 SonnetText in and outImage input

  5. +248 days

    Claude 3.7 SonnetText in and outImage input

    reasoning

    from Claude 3.5 Sonnet first evidenced: reasoning

  6. +87 days

    Claude Opus 4Text in and outImage input

    agentic

    from Claude 3 Opus first evidenced: agentic, coding

  7. +130 days

    Claude Sonnet 4.5Text in and outImage input

    multilingual

    from Claude 3.7 Sonnet first evidenced: agentic, multilingual

  8. +16 days

    Claude Haiku 4.5

  9. +40 days

    Claude Opus 4.5Text in and outImage input

    from Claude Opus 4 first evidenced: multilingual

  10. +73 days

    Claude Opus 4.6Text in and outImage input

    from Claude Opus 4.5 Context window 200K → 1M

  11. +12 days

    Claude Sonnet 4.6Text in and outImage input

    from Claude Sonnet 4.5 Context window 200K → 1M

  12. +58 days

    Claude Opus 4.7Text in and outImage input

  13. +42 days

    Claude Opus 4.8Text in and outImage input

  14. +12 days

    2 released the same day

    Claude Fable 5Text in and outImage input
    Claude Mythos 5Text in and outImage input

  15. +21 days

    Claude Sonnet 5Text in and outImage input

    from Claude Sonnet 4.6 first evidenced: reasoning

  16. +24 days

    Claude Opus 5Text in and outImage input

    from Claude Opus 4.8 first evidenced: reasoning, coding

  17. +39 days

    2 released the same day

    Claude Fable 5.1
    Claude Mythos 5.1

  18. +21 days

    Claude Opus 5.5

  19. +6 days

    Claude Sonnet 5.5

  20. +9 days

    Claude Haiku 5.5

    from Claude Haiku 4.5 Context window 200K → 1M

Context window over time

Only releases with a disclosed context window appear.

Claude 1 · 2023 9K tokens
Claude 2 · 2023 100K tokens
Claude 3 Opus · 2024 200K tokens
Claude 3.5 Sonnet · 2024 200K tokens
Claude 3.7 Sonnet · 2025 200K tokens
Claude Opus 4 · 2025 200K tokens
Claude Sonnet 4.5 · 2025 200K tokens
Claude Haiku 4.5 · 2025 200K tokens
Claude Opus 4.5 · 2025 200K tokens
Claude Opus 4.6 · 2026 1M tokens
Claude Sonnet 4.6 · 2026 1M tokens
Claude Opus 4.7 · 2026 1M tokens
Claude Opus 4.8 · 2026 1M tokens
Claude Fable 5 · 2026 1M tokens
Claude Mythos 5 · 2026 1M tokens
Claude Sonnet 5 · 2026 1M tokens
Claude Opus 5 · 2026 1M tokens
Claude Fable 5.1 · 2026 1M tokens
Claude Mythos 5.1 · 2026 1M tokens
Claude Opus 5.5 · 2026 1M tokens
Claude Sonnet 5.5 · 2026 1M tokens
Claude Haiku 5.5 · 2026 1M tokens

What changed

Generation to generation, from evidenced values only. A field is compared only where both releases record it — otherwise it is called out as not comparable, so a research gap never reads as a change the lab made.

Across every generation of this family, parameters could not be compared — the values are not recorded on both sides of any step. That is a gap in this dataset, not a statement about the models. See data quality.

Claude 1 → Claude 2 119 days

Context window
9K → 100K

Claude 3.5 Sonnet → Claude 3.7 Sonnet 248 days

Capabilities first evidenced
+ reasoning

Claude 3 Opus → Claude Opus 4 444 days

Capabilities first evidenced
+ agentic + coding

Claude 3.7 Sonnet → Claude Sonnet 4.5 217 days

Capabilities first evidenced
+ agentic + multilingual

Claude Opus 4 → Claude Opus 4.5 186 days

Capabilities first evidenced
+ multilingual

Claude Opus 4.5 → Claude Opus 4.6 73 days

Context window
200K → 1M

Claude Sonnet 4.5 → Claude Sonnet 4.6 141 days

Context window
200K → 1M

Claude Opus 4.6 → Claude Opus 4.7 70 days

No change in any field both releases record.

Claude Opus 4.7 → Claude Opus 4.8 42 days

No change in any field both releases record.

Claude Sonnet 4.6 → Claude Sonnet 5 133 days

Capabilities first evidenced
+ reasoning

Claude Opus 4.8 → Claude Opus 5 57 days

Capabilities first evidenced
+ reasoning + coding

Claude Fable 5 → Claude Fable 5.1 84 days

No change in any field both releases record.

Not comparable here: capabilities and modalities (not researched on both releases).

Claude Mythos 5 → Claude Mythos 5.1 84 days

No change in any field both releases record.

Not comparable here: capabilities and modalities (not researched on both releases).

Claude Opus 5 → Claude Opus 5.5 60 days

No change in any field both releases record.

Not comparable here: capabilities and modalities (not researched on both releases).

Claude Sonnet 5 → Claude Sonnet 5.5 90 days

No change in any field both releases record.

Not comparable here: capabilities and modalities (not researched on both releases).

Claude Haiku 4.5 → Claude Haiku 5.5 357 days

Context window
200K → 1M

Not comparable here: capabilities and modalities (not researched on both releases).

Compare the two most recent side by side →
All releases from Anthropic →