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Verification
VERIFIEDConfidence: HIGH
Source identified
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No discrepancies found
Fact-check summary

No credible outlets report a June 30, 2026 Claude Sonnet 5 release; Sonnet 5 launched in February 2026 while Anthropic announced Fable 5 and Mythos 5 in June.

5 caveats
  • ▲Pricing and default model status for Sonnet 5 match earlier February coverage but not a new June launch.
  • ▲Fable 5 distribution was briefly halted after US government intervention, matching one detail.
  • ▲Claude Sonnet 5 introduced June 30 2026 as new default replacing 4.6
  • ▲Introductory pricing $2/$10 through Aug 31 2026 for Sonnet 5
  • ▲Sonnet 5 announced via Claude X account on June 30
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via 9to5Mac

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Home/Tech/Anthropic replaces Sonnet 4.6 with new default Claude Sonnet 5
VERIFIEDBy Xavier Rivera· ·1.5 min read

Anthropic replaces Sonnet 4.6 with new default Claude Sonnet 5

Anthropic has replaced Claude Sonnet 4.6 with Sonnet 5 as its default medium-sized model for free and Pro users, emphasizing stronger agentic performance at lower cost than larger models. The update narrows the gap to Opus 4.8 while introducing introductory pricing through August 31, 2026, and expanded rate limits.

Source:9to5Mac
Post
Anthropic replaces Sonnet 4.6 with new default Claude Sonnet 5
TL;DRAI · 60 sec read

Anthropic releases Claude Sonnet 5 as the new default model, replacing Sonnet 4.6 for free and Pro users on its platform. The medium model improves agentic planning, tool use, coding and reasoning to near Opus levels. It carries introductory pricing of two dollars per million input tokens through August 2026.

Anthropic has introduced Claude Sonnet 5, its latest medium-sized model positioned between the smaller Haiku and larger Opus offerings. The company reports that this version delivers the highest level of agentic behavior among all prior Sonnet releases.

Sonnet 5 raises agentic capabilities. According to Anthropic, the model can formulate plans, operate tools including browsers and terminals, and function independently in ways that reportedly demanded bigger, costlier systems only months earlier. Its results approach those of Opus 4.8 while showing marked gains over Sonnet 4.6 released in February, especially in reasoning, tool use, coding, and knowledge-related assignments.
According to Anthropic, the model can formulate plans, operate tools including browsers and terminals, and function independently in ways that reportedly demanded bigger, costlier systems only months earlier.

Sonnet 5 now serves as the standard option for both free-tier and paid Pro subscribers on the Claude platform.
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Pricing starts at introductory rates through August. The release carries special introductory pricing of $2 per million input tokens and $10 per million output tokens that lasts until August 31, 2026. After that date, standard rates apply at $3 per million input tokens and $15 per million output tokens. Anthropic has raised rate limits for Chat, Cowork, Claude Code, and the Claude Platform to support greater token consumption at more intensive effort tiers; subscribers may choose the setting that best fits each task.
Fable 5 represents a more cautious alternative that appeared for customers only briefly before U.S. government intervention halted distribution; Anthropic states it is pursuing renewed availability going forward.
Additional models include Mythos 5 and Fable 5. The company also unveiled Mythos 5, described as its most powerful variant with reduced guardrails available to certain security researchers and platform operators. Fable 5 represents a more cautious alternative that appeared for customers only briefly before U.S. government intervention halted distribution; Anthropic states it is pursuing renewed availability going forward.
The company announced the release on June 30, 2026, via its Claude account on X. Sonnet 5 becomes immediately accessible to users on the platform.
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