Claude Model Releases

Mon, 30 Mar 2026 00:00:00 +0000

Claude Model Releases

This text traces the evolution of the Claude model family from its first public release through the current generation. Each generation expanded capabilities, introduced new tiers, or opened new access methods. The pattern is one of increasing breadth: early releases were text-only conversation models; later releases added vision, tool use, computer use, and extended thinking, progressively widening the action space available to agentic systems built on Claude.

Timeline

Generation	Date	Key models	What changed
Claude 1	March 2023	Claude 1.0, Claude Instant	First public API release. Text-only, 9K context
Claude 2	July 2023	Claude 2.0, Claude 2.1	Expanded context to 100K tokens. Improved instruction-following
Claude 3	March 2024	Haiku, Sonnet, Opus	Three-tier structure introduced. Vision capability (image understanding). 200K context. Opus was the frontier capability benchmark
Claude 3.5	June 2024	3.5 Sonnet	Surpassed Claude 3 Opus on most benchmarks at Sonnet-tier cost. The first time a lower tier exceeded the previous generation’s top tier
Claude 3.5 v2	October 2024	3.5 Sonnet (upgraded), 3.5 Haiku	Computer use introduced as beta capability. The model could now interact with graphical interfaces via screenshots and mouse/keyboard actions
Claude 4	January 2025	Opus 4, Sonnet 4	Opus 4 positioned as “world’s best coding model.” Major improvements in agentic task completion, multi-step reasoning, and code generation. Claude Code shipped alongside Claude 3.7 Sonnet shortly before
Claude 4.1	2025	Opus 4.1	Incremental improvements to Opus capability
Claude 4.5	2025	Opus 4.5, Sonnet 4.5, Haiku 4.5	Full-tier refresh. Opus 4.5 described as “best model in the world for coding, agents, and computer use”
Claude 4.6	2025	Opus 4.6, Sonnet 4.6	Current generation. Opus 4.6 available with 1M context. Powers Claude Code

Patterns in the release history

Tier leapfrogging. Claude 3.5 Sonnet surpassing Claude 3 Opus established a pattern: each generation’s mid-tier can exceed the previous generation’s top tier. This means the most cost-effective model at any moment is often last generation’s capability at this generation’s price.

ModelReleases on emsenn.net

Claude Model Releases

Claude Model Releases

Timeline

Patterns in the release history