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Claude Sonnet 5.5
★ LIVE
by Anthropic
JUST LANDED · UPDATING HOURLY
CLOSEDHOSTEDAPILONG CONTEXTPAIDREASONING
RANKED #324 OF 338 ASSISTANTS · OVERALL #509 OF 529 RANKED · VIBE SCORE 4.7 · 366 VOICES
COPY BADGE pastes a README snippet with the rank SVG.
Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade. It is especially strong at building features, fixing bugs, and producing...
HAPPY6.4
35 mentions
SAD8.6
34 mentions
VIBE TRAJECTORY
26 weeks · 2,455 voices
HONEYMOON FADING
Early praise is cooling off in recent weeks.
HOW TO USE IT
Closed model. Anthropic hosts it, so you use it through an app or an API.
PREFER OPEN SOURCE? THE CROWD HAS PICKS
Claude Sonnet 5.5 is closed, so you rent it. These open-weight models can genuinely stand in for it. Download once, own forever.
Qwen3.8 27BWHAT THE INTERNET SAYS
The internet is split on Claude Sonnet 5.5.
102 POSTS · 264 COMMENTS · REDDIT · HACKER NEWS · GITHUB
PEOPLE LOVE
- People feel it is worth the money (2 mentions)
PEOPLE COMPLAIN ABOUT
- People find it expensive (2 mentions)
TOPIC BY TOPIC
- PriceMIXED FEELINGS
2 thumbs up · 2 thumbs down
IN THEIR OWN WORDS
- FROM REDDIT >
“Sonnet 5.5 is by far the best free model available right now.”
LOOKING FOR AN ALTERNATIVE?
Other models the crowd has fully reviewed, starting with multimodal models like this one.
Grok 4.6> SOURCES (12)
- REDDIT · 2026-09-22 · 86 UPVOTESSonnet 5.5 and Haiku 5.5 Coming Soon!
Sonnet 5.5 and Haiku 5.5 Coming Soon!
- REDDIT · 2026-09-02 · 67 UPVOTESGood, cheap, token hungry
Good, cheap, token hungry
- REDDIT · 2026-09-20 · 34 UPVOTES48 hrs: 5-hour limits have been a joke!
48 hrs: 5-hour limits have been a joke!
- REDDIT · 2026-04-26 · 14 UPVOTESGoing from 3B/7B dense to Nemotron 3 Nano (hybrid Mamba-MoE) for multi-task reasoning — what changes in the fine-tuning playbook? [D]
Going from 3B/7B dense to Nemotron 3 Nano (hybrid Mamba-MoE) for multi-task reasoning — what changes in the fine-tuning playbook? [D]
- HACKER NEWS · 2026-09-28 · 4 UPVOTESClaude Sonnet 5.5 (Max Effort) Intelligence, Performance and Price Analysis
Claude Sonnet 5.5 (Max Effort) Intelligence, Performance and Price Analysis
- REDDIT · 2026-09-28 · 3 UPVOTESHow I’ve been feeling lately
How I’ve been feeling lately
- REDDIT · 2026-09-28 · 3 UPVOTESComment in r/artificial
Comment in r/artificial
- REDDIT · 2026-07-17 · 1 UPVOTESMy AI agents have now run on four model generations (we skipped one entirely). Their memory never noticed.
My AI agents have now run on four model generations (we skipped one entirely). Their memory never noticed.
- REDDIT · 2026-09-23 · 0 UPVOTESAmor Futuri
Amor Futuri
- GITHUB · 2026-09-28 · 0 UPVOTESfeat(ai): enable Claude Sonnet 5.5
<!-- CURSOR_AGENT_PR_BODY_BEGIN --> Closes: ZAP-1170 Description: Enables Claude Sonnet 5.5 using the ids from Anthropic's models overview and the Sonnet 5.5 migration guide. - Claude API id: claude-sonnet-5-5 (dateless pinned snapshot) - Amazon Bedrock id:…
- GITHUB · 2026-09-28 · 0 UPVOTESUpdate model defaults to Claude Sonnet/Opus 5.5, GPT-6 Sol/Luna, and Eleven v4
Summary Refreshes every default model ID against provider catalogs checked on 2026-09-28. Surface Before After --- --- --- Anthropic / Vertex AI claude-sonnet-5, claude-opus-5 claude-sonnet-5-5, claude-opus-5-5 Bedrock anthropic.claude-{sonnet,
- GITHUB · 2026-09-28 · 0 UPVOTESfeat(models): add Claude Sonnet 5.5, align Claude/Codex order, bump Claude Agent SDK
Problem Claude and Codex model lists were not in one consistent order across ADE surfaces, and ADE had no Claude Sonnet 5.5 row. The pinned @anthropic-ai/claude-agent-sdk (0.3.280, bundled CLI 2.1.280, built 2026-09-21) predates Sonnet 5.5 (released…