effort controlled · default medium
Only provider-documented reasoning controls are shown; missing controls remain unpublished rather than inferred.
MODEL REFERENCE / ANTHROPIC
Claude Opus 5.5
verified model reference.
Current Opus model for long-running agentic coding and complex knowledge work.
1,000,000context tokens
128,000max output
2026-09-27last verified
PRIMARY-SOURCE VERIFIED
Claude Opus 5.5 at a glance.
Anthropic documents a 1,000,000-token context window. Input modalities: text + image. Output: text. Pricing status: Official paid API.
MODEL IDclaude-opus-5-5
CONTEXT WINDOW1,000,000tokens
MAX OUTPUT128,000
KNOWLEDGE CUTOFF2026-06
STANDARD INPUT$4.00per 1 million tokens
STANDARD OUTPUT$20.00per 1 million tokens
CAPABILITY CONTRACT
Published model behavior.
text + image
Input modalities come from the cited official model documentation.
text
Output modality and output-limit claims remain separate so an undocumented token cap is not guessed.
PRICING STATUS
Official paid API.
$4.00 input · $0.20 cached · $20.00 output per 1 million tokens.
SXF preserves the provider-published native billing basis. Only calculator-eligible generative token models enter token-cost arithmetic; specialist units and input-only embeddings remain visible without forced conversion.
EXPLORE
Keep the model in context.
OFFICIAL SOURCES
Verification links.
WHAT CHANGED
Claude Opus 5.5: what changed.
No post-baseline factual changes recorded for Claude Opus 5.5 since 2026-09-27.
VERIFIED BASELINE2026-09-27Current facts remain aligned with the SXF ledger.
VERIFIED CHANGE HISTORY
Claude Opus 5.5 verified history.
Claude Opus 5.5
Baseline verified: 1,000,000 context · 128,000 max output · $4.00 input / $0.20 cached / $20.00 output per 1 million tokens
Official evidence ↗Append-only SXF ledger · 1 verified event · chain head 5cb61a0bb057…
COMPARE CLAUDE OPUS 5.5
Put this model in context.
EVALUATION EVIDENCE
Claude Opus 5.5 benchmark observations.
independentArtificial Analysis
AA-Briefcase 1.1
1,808 Eloagentic knowledge work · reasoning max
Evidence ↗independentArtificial Analysis
Artificial Analysis Intelligence Index 4.3.2
58composite intelligence · reasoning max
Evidence ↗independentArtificial Analysis
AA-LCR 1.1
85.0%long context reasoning · reasoning max
Evidence ↗independentArtificial Analysis
AutomationBench-AA
70.0%business automation · reasoning max
Evidence ↗independentArtificial Analysis · under review
CritPt
32.0%frontier science reasoning · reasoning max
Evidence ↗independentArtificial Analysis
GDPval-AA 2.1
1,867 Eloprofessional knowledge work · reasoning max
Evidence ↗independentArtificial Analysis
Humanity's Last Exam
61.0%multidisciplinary reasoning · reasoning max
Evidence ↗independentArtificial Analysis · under review
SciCode
67.0%scientific coding · reasoning max
Evidence ↗Scores are shown only with their evaluator, benchmark version and model configuration. They are not merged into a universal model score.