Claude Sonnet 5.5
ReleasedModel Claude Sonnet 5.5 is a model by Anthropic, released on 28 Sept 2026 (17 days ago).
In the Frontier SetAnthropic positions this model in its top tier — role: Fast & efficient. “The best combination of speed and intelligence” Source: platform.claude.com · checked on 4 Oct 2026
- Where can it be used?
- Evidenced as usable in: Claude, Claude Code, Claude Enterprise, Claude Team, GitHub CopilotFor 9 more recorded products there is no statement; that does not mean “not available”.Available in the provider’s API
- Did we test it?
- No lab run published yet
- Last change
- 17 days ago
- Evidence
- 7 sources from 4 sitesRegistry entry:
What backs this up?
Three kinds of evidence, kept apart. None of them proves AGI on its own; where one is missing, the page says so.
- In real productsEvidenced as usable in: Claude, Claude Code, Claude Enterprise, Claude Team, GitHub Copilot
- agi.jetzt PrüfstandNo published run yet.
- Public benchmarks18 reported results on 12 benchmarks — each with its source
A model and the product around it are different things: a result for one does not carry over to the other.
Public benchmark results
Results reported by benchmark maintainers or providers, each with its source. They are not averaged and not compared across benchmarks; a provider result is self-reported. Some sources are data files of the benchmark’s own site rather than pages; they are marked as machine-readable.
- Claude Sonnet 5.575.9 %SimpleBench · avg5 · accuracy (average of 5 runs)evaluated 01/10/2026 · benchmark maintainer · model alone · pass@k: AVG@5 · temperature: 0.7 (top-p 0.95)Machine-readable source: simple-bench.com · JavaScript file — SimpleBench, Claude Sonnet 5.5
- Claude Sonnet 5.552.1 %FrontierCode · 1.1-main · overall score (mergeability)source as of 29/09/2026 · benchmark maintainer · mode not stated · judge: model-graded rubric checks (grader not named on leaderboard) · tools: yes · web: yesSource: cognition.com — FrontierCode, Claude Sonnet 5.5
- Claude Sonnet 5.580.49 %FrontierMath Tier 4 · v2 · accuracy (mean score)evaluated 29/09/2026 · benchmark maintainer · mode not stated · tools: yes · budget: 1,000,000 tokens hard limit (forced submission at 660,000) · setting: Epoch AI FrontierMath implementation (Inspect): python tool + submit_answer tool · web: no · reasoning: max · reported as „claude-sonnet-5-5_max“Machine-readable source: epoch.ai · ZIP download — FrontierMath Tier 4, Claude Sonnet 5.5
- Claude Sonnet 5.588.77 %FrontierMath Tiers 1–3 · v2 · accuracy (mean score)evaluated 29/09/2026 · benchmark maintainer · mode not stated · tools: yes · budget: 1,000,000 tokens hard limit (forced submission at 660,000) · setting: Epoch AI FrontierMath implementation (Inspect): python tool + submit_answer tool · web: no · reasoning: max · reported as „claude-sonnet-5-5_max“Machine-readable source: epoch.ai · ZIP download — FrontierMath Tiers 1–3, Claude Sonnet 5.5
- Claude Sonnet 5.50.35AA-Omniscience (net score) · public-split · net score (correct − incorrect)source as of 28/09/2026 · self-reported by the provider · model alone · web: noSource: www-cdn.anthropic.com · PDF — AA-Omniscience (net score), Claude Sonnet 5.5
- Claude Sonnet 5.574.7 %BenchCAD Vision2Code · v1 · voxel IoU, no toolssource as of 28/09/2026 · self-reported by the provider · mode not stated · tools: no · setting: Anthropic internal; random 1,000-file subset of 17,900 Vision2Code files; 256x256 px views (corrected) · attempts: 5 · reasoning: adaptive thinking, max effortSource: www-cdn.anthropic.com · PDF — BenchCAD Vision2Code, Claude Sonnet 5.5
- Claude Sonnet 5.596.3 %BenchCAD Vision2Code · v1 · voxel IoU, with toolssource as of 28/09/2026 · self-reported by the provider · mode not stated · tools: yes · setting: Anthropic internal; random 1,000-file subset of 17,900 Vision2Code files; 256x256 px views (corrected) · attempts: 5 · reasoning: adaptive thinking, max effortSource: www-cdn.anthropic.com · PDF — BenchCAD Vision2Code, Claude Sonnet 5.5
- Claude Sonnet 5.561.6 %Chartography · v1 · accuracy (expert-range graded), no toolssource as of 28/09/2026 · self-reported by the provider · mode not stated · judge: Gemini 3.5 Flash · tools: no · setting: Anthropic internal implementation of Chartography · attempts: 5 · web: no · reasoning: adaptive thinking, max effort · computer use: noSource: www-cdn.anthropic.com · PDF — Chartography, Claude Sonnet 5.5
- Claude Sonnet 5.590.2 %Chartography · v1 · accuracy (expert-range graded), with toolssource as of 28/09/2026 · self-reported by the provider · mode not stated · judge: Gemini 3.5 Flash · tools: yes · setting: Anthropic internal implementation of Chartography · attempts: 5 · web: no · reasoning: adaptive thinking, max effort · computer use: noSource: www-cdn.anthropic.com · PDF — Chartography, Claude Sonnet 5.5
- Claude Sonnet 5.556.9 %Humanity's Last Exam · provider-run · accuracysource as of 28/09/2026 · self-reported by the provider · model alone · judge: Claude Opus 4.6 · budget: 980k token task budget · attempts: 5 · web: no · reasoning: adaptive thinking, max effort (thinking "auto" per §8.11.1) · temperature: default sampling settingsSource: www-cdn.anthropic.com · PDF — Humanity's Last Exam, Claude Sonnet 5.5
- Claude Sonnet 5.564.5 %Humanity's Last Exam · provider-run · accuracy · toolssource as of 28/09/2026 · self-reported by the provider · model + harness · web search, web fetch, programmatic tool calling, code execution; HLE-source blocklist · judge: Claude Opus 4.6 · tools: yes · budget: 980k token task budget · attempts: 5 · web: yes · reasoning: adaptive thinking, max effort (thinking "auto" per §8.11.1) · temperature: default sampling settingsSource: www-cdn.anthropic.com · PDF — Humanity's Last Exam, Claude Sonnet 5.5
- Claude Sonnet 5.554.3 %SWE-bench Multimodal · v1 · resolve ratesource as of 28/09/2026 · self-reported by the provider · mode not stated · tools: yes · attempts: 5 · reasoning: adaptive thinking, max effortSource: www-cdn.anthropic.com · PDF — SWE-bench Multimodal, Claude Sonnet 5.5
Show 6 more
- Claude Sonnet 5.570.6 %Terminal-Bench · 4.0 · task success ratesource as of 28/09/2026 · self-reported by the provider · mode not stated · tools: yes · reasoning: max effortSource: www.anthropic.com — Terminal-Bench, Claude Sonnet 5.5
- Claude Sonnet 5.533.1 %HLE-Diamond · 2026-09-22 · accuracysource as of 22/09/2026 · benchmark maintainer · model alone · web: no · reasoning: highSource: lastexam.ai — HLE-Diamond, Claude Sonnet 5.5
- Claude Sonnet 5.543.3 %HLE-Diamond · 2026-09-22 · accuracysource as of 22/09/2026 · benchmark maintainer · model alone · web: no · reasoning: maxSource: lastexam.ai — HLE-Diamond, Claude Sonnet 5.5
- Claude Sonnet 5.542.4 %HLE-Diamond · 2026-09-22 · accuracy · reasoning halfsource as of 22/09/2026 · benchmark maintainer · model alone · subset: reasoning partition (500 questions) · web: no · reasoning: highSource: lastexam.ai — HLE-Diamond, Claude Sonnet 5.5
- Claude Sonnet 5.580.1 %OSWorld · 2.0-2026-09-10-tasks · partial scorehistoricalself-reported by the provider · model + harness · Anthropic computer-use harness with server-side context compaction · tools: yes · budget: 500 action steps, 1080p · attempts: 5 · reasoning: max effort · computer use: yesSource: www-cdn.anthropic.com · PDF — OSWorld, Claude Sonnet 5.5
- Claude Sonnet 5.561.82 %Terminal-Bench · 4.0 · accuracyhistoricalbenchmark maintainer · model + harness · Claude Code · reasoning: max · reported as „Sonnet 5.5“Source: www.tbench.ai — Terminal-Bench, Claude Sonnet 5.5
Where can it be used?
Only recorded availability statements are shown. A missing plan or surface means unknown, not unavailable. Where it applies only to a plan or a region, the row says so. “Rolling out” is not “available”. “Rollout reported” means a rollout was reported, but nothing has supported it for more than 90 days.
| Product | Status | since | Checked | Sources |
|---|---|---|---|---|
| ClaudeApp · Free | Limited availability | not documented | checked 4 Oct 2026 | 1www.anthropic.com |
| ClaudeApp | Limited availability | not documented | checked 11 Oct 2026 | 1support.claude.com |
| ClaudeApp · Max 20x | Limited availability | not documented | ||
| ClaudeApp · Max 5x | Limited availability | not documented | ||
| ClaudeApp · Pro | Limited availability | not documented | ||
| Claude CodeCode | Limited availability | not documented | checked 11 Oct 2026 | 1support.claude.com |
| Claude EnterpriseWork · Enterprise | Limited availability | not documented | ||
| Claude TeamWork · Team | Limited availability | not documented | ||
| GitHub CopilotCopilot · Business | Limited availability | not documented | checked 11 Oct 2026 | 1docs.github.com |
| GitHub CopilotCopilot · Enterprise | Limited availability | not documented | checked 11 Oct 2026 | 1docs.github.com |
| GitHub CopilotCopilot · Max | Limited availability | not documented | checked 11 Oct 2026 | 1docs.github.com |
| GitHub CopilotCopilot · Pro | Limited availability | not documented | checked 11 Oct 2026 | 1docs.github.com |
| GitHub CopilotCopilot · Pro Plus | Limited availability | not documented | checked 11 Oct 2026 | 1docs.github.com |
| GitHub Copilot | Limited availability | not documented | checked 11 Oct 2026 | 1docs.github.com |
Where a start is “not documented”, a source check found the state in place; the source names no start date.
No statement on record for 9 further products: ChatGPT, ChatGPT Work, Codex, Gemini, Gemini for Google Workspace, Grok, Langdock, Le Chat Enterprise, Microsoft 365 Copilot. No statement is not the same as not available.
Developer APIs
Developer access — not a statement about any work product.
| Product | Status | since | Checked | Sources |
|---|---|---|---|---|
| Claude APIAPI | Available | not documented | checked 3 Oct 2026 | 1platform.claude.com |
What did we test?
No lab run of Claude Sonnet 5.5 is published yet.
Nothing is shown until a real run exists. See what the lab tests:
Lifecycle and history
The dates the provider confirmed, and every recorded period of availability. A current period shows its checked status; one without a source check is marked not verified.
Announced—not recorded
Released
Deprecated—not recorded
Retired—not recorded
What changed?
Sourced changes concerning this model, newest first.
- 17 days ago
1platform.claude.com
Evidence
Every source document behind the facts on this page, by domain.
| Domain | Docs | Documents |
|---|---|---|
| support.claude.com | 3 | |
| platform.claude.com | 2 | |
| docs.github.com | 1 | |
| www.anthropic.com | 1 |