--- title: "Anthropic: Claude Opus 5.5 — unrated, priced in this catalogue · Undominated.ai" canonical: https://undominated.ai/models/anthropic__claude-opus-5.5/ description: "Anthropic: Claude Opus 5.5: $4.00/M in, $20.00/M out. No independent quality score in this catalogue — unrated, not ranked, not scored zero." --- # Anthropic: Claude Opus 5.5 — unrated, priced in this catalogue · Undominated.ai > Anthropic: Claude Opus 5.5: $4.00/M in, $20.00/M out. No independent quality score in this catalogue — unrated, not ranked, not scored zero. [Check base rates for this workload](/check/anthropic__claude-opus-5.5/) [Cheaper alternatives](/alternatives/) [Family](/families/claude/) [Compare models](https://undominated.ai/compare/?models=anthropic%2Fclaude-opus-5.5) Comparison context Choose up to three standard models in Compare. Requirements and prompt length apply in Compare. This page keeps its stated price basis and workload controls. MODEL PROOF # Claude Opus 5.5 Anthropic · 22 Sept 2026 Balanced Summarise Chat Code gen Agentic NOT INDEPENDENTLY RATED ## No independent LMArena score is published for this model. **$8.00** / 1M tokens Balanced · 3 tokens in per 1 out Evidence as of 23 Sept 2026 [openrouter/models](https://openrouter.ai/api/v1/models) Independent LMArena score Not independently rated Context window 1M Maximum output 128K Input modalities text, image, file Output modalities text Published input price $4.00 / 1M tokens Published output price $20.00 / 1M tokens Pricing kind fixed Inspect [complete billing conditions](#billing-details) and endpoint terms below. Every price dimension · USD per million tokens | Input | $4.00 /M | | --- | --- | | Output | $20.00 /M | | Cached input | $0.200 /M | | Cache write | $5.00 /M | | Cache write 1h | $8.00 /M | | Reasoning | Unknown /M | | Web search | $0.01 /call | ### Who sells it The same weights, different shops. Cheapest is not like-for-like when serving precision differs. 11 provider offers · rates, limits and conditions Rates are USD per million tokens. Endpoint terms can differ even when the quoted price and precision match. A listed parameter is a provider declaration, not a task-success test. | Seller | Input | Output | Precision | Uptime (1d) | | --- | --- | --- | --- | --- | | Seller Amazon Bedrock amazon-bedrock Endpoint terms Cached input /M $0.200 Context limit 1,000,000 tokens Output limit 128,000 tokens Tools Listed by endpoint Reasoning Listed by endpoint Promotional discount None reported Uptime · last 30 minutes 99.81% | Input $4.00 | Output $20.00 | Precision undeclared | Uptime (1d) 99.87% | | Seller Azure azure/global Endpoint terms Cached input /M $0.200 Context limit 1,000,000 tokens Output limit 128,000 tokens Tools Listed by endpoint Reasoning Listed by endpoint Promotional discount None reported Uptime · last 30 minutes 100.00% | Input $4.00 | Output $20.00 | Precision undeclared | Uptime (1d) 99.97% | | Seller Google google-vertex/global Endpoint terms Cached input /M $0.200 Context limit 1,000,000 tokens Output limit 128,000 tokens Tools Listed by endpoint Reasoning Listed by endpoint Promotional discount None reported Uptime · last 30 minutes 100.00% | Input $4.00 | Output $20.00 | Precision undeclared | Uptime (1d) 99.97% | | Seller Claude Platform on AWS claude-on-aws Endpoint terms Cached input /M $0.200 Context limit 1,000,000 tokens Output limit 128,000 tokens Tools Listed by endpoint Reasoning Listed by endpoint Promotional discount None reported Uptime · last 30 minutes 99.87% | Input $4.00 | Output $20.00 | Precision undeclared | Uptime (1d) 99.98% | | Seller Anthropic anthropic Endpoint terms Cached input /M $0.200 Context limit 1,000,000 tokens Output limit 128,000 tokens Tools Listed by endpoint Reasoning Listed by endpoint Promotional discount None reported Uptime · last 30 minutes 100.00% | Input $4.00 | Output $20.00 | Precision undeclared | Uptime (1d) 99.99% | | Seller Amazon Bedrock amazon-bedrock/eu-west-1 Endpoint terms Cached input /M $0.220 Context limit 1,000,000 tokens Output limit 128,000 tokens Tools Listed by endpoint Reasoning Listed by endpoint Promotional discount None reported Uptime · last 30 minutes Unknown | Input $4.40 | Output $22.00 | Precision undeclared | Uptime (1d) 100.00% | | Seller Amazon Bedrock amazon-bedrock/us-east-1 Endpoint terms Cached input /M $0.220 Context limit 1,000,000 tokens Output limit 128,000 tokens Tools Listed by endpoint Reasoning Listed by endpoint Promotional discount None reported Uptime · last 30 minutes Unknown | Input $4.40 | Output $22.00 | Precision undeclared | Uptime (1d) 99.96% | | Seller Azure azure/us Endpoint terms Cached input /M $0.220 Context limit 1,000,000 tokens Output limit 128,000 tokens Tools Listed by endpoint Reasoning Listed by endpoint Promotional discount None reported Uptime · last 30 minutes Unknown | Input $4.40 | Output $22.00 | Precision undeclared | Uptime (1d) 100.00% | | Seller Google google-vertex/us Endpoint terms Cached input /M $0.220 Context limit 1,000,000 tokens Output limit 128,000 tokens Tools Listed by endpoint Reasoning Listed by endpoint Promotional discount None reported Uptime · last 30 minutes Unknown | Input $4.40 | Output $22.00 | Precision undeclared | Uptime (1d) 100.00% | | Seller Google google-vertex/europe Endpoint terms Cached input /M $0.220 Context limit 1,000,000 tokens Output limit 128,000 tokens Tools Listed by endpoint Reasoning Listed by endpoint Promotional discount None reported Uptime · last 30 minutes Unknown | Input $4.40 | Output $22.00 | Precision undeclared | Uptime (1d) 100.00% | | Seller Anthropic anthropic/fast Endpoint terms Cached input /M $0.400 Context limit 1,000,000 tokens Output limit 128,000 tokens Tools Listed by endpoint Reasoning Listed by endpoint Promotional discount None reported Uptime · last 30 minutes 100.00% | Input $8.00 | Output $40.00 | Precision undeclared | Uptime (1d) 99.98% | ### Independent scores No independent benchmark has measured this model. Unrated is not a score of zero. ### Capability | Context window | 1M | | --- | --- | | Max output | 128K | | Input modes | text, image, file | | Tool use | yes | | Reasoning | always on | | Open weights | Unknown | ### Provenance | Price source | [openrouter.ai](https://openrouter.ai/api/v1/models) | | --- | --- | | Fetched | 2026-09-23 | | Quality data | unrated | Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code... ## Questions this page answers What does Claude Opus 5.5 cost? $4.00/M in, $20.00/M out in this catalogue, as of the fetch date on this page. That is the API row, not a subscription. Does Claude Opus 5.5 have an independent quality score? Claude Opus 5.5 has no independent quality score in this catalogue. Unrated is not a score of zero. What beats Claude Opus 5.5? Claude Opus 5.5 has no independent quality score. Unrated is not a score of zero. Does this page use Artificial Analysis scores for Claude Opus 5.5? No. Artificial Analysis figures are not published here. Quality on this page is LMArena Elo where a score exists; otherwise the row is unrated. Does a missing score mean Claude Opus 5.5 scored zero? Unrated is not a score of zero. MODEL MONUMENT ## Save or share this proof Download proof card · 1200 × 630 Preview and more sharing options Anthropic: Claude Opus 5.5. Balanced workload. Not independently rated. Evidence as of 23 Sept 2026. Copy model link Download square card · 1080 × 1080 Copy landscape image Share landscape card ## Related No independent quality score, so there is no dominator to name. Unrated is not a clean bill of health. - Same vendor [Claude Fable 5.1](/models/anthropic__claude-fable-5.1/) - Anthropic models [Anthropic](/providers/anthropic/) - Where this model appears [effort](/effort/) - Same vendor [Claude Opus 5](/models/anthropic__claude-opus-5/) - Where this model appears [plans](/plans/) - Same vendor [Claude Opus 4.6](/models/anthropic__claude-opus-4.6/) ## Badge The verdict as one SVG, for a README or a docs page. It states this model's dominance status at the balanced workload on the LMArena lens, with the date it was computed, and it is rebuilt with the catalogue — so it changes when the verdict changes, including to one you would rather it did not. Markdown Copy [![Claude Opus 5.5 — Undominated.ai dominance verdict](https://undominated.ai/badge/anthropic__claude-opus-5.5.svg)](https://undominated.ai/models/anthropic__claude-opus-5.5/) HTML Copy Claude Opus 5.5 — Undominated.ai dominance verdict Direct file: [https://undominated.ai/badge/anthropic__claude-opus-5.5.svg](https://undominated.ai/badge/anthropic__claude-opus-5.5.svg) — a static SVG, written by scripts/build-badges.mjs on every build, so the copy you embed is never older than the last deploy. ## Continue your investigation - [Explore model families](/families/) - [Compare a shortlist](/compare/) - [Check a model](/check/) - [Understand the evidence](/methodology/)