Proprietary dense model from Anthropic. Parameter count is undisclosed. Native 1M-token context, 128K max output, knowledge cutoff May 2026. Adaptive thinking is on by default and can only be disabled at high effort or below; effort levels run low through max. Prompt caching minimum is 512 tokens (down from 1,024 on Opus 4.8).
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Modalities: text, image, and PDF input; text output. Up to 600 images or PDF pages per request.
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Pricing (standard): $5/1M input, $25/1M output.
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Pricing (Fast mode): $10/1M input, $50/1M output.
Agents on Rails benchmark (Aug 2026, Le Mans round). 92.1% accuracy on 63 runs - the top score in the 16-model field. Anthropic positioned Opus 5 as a step-change in agentic coding and long-horizon tasks, and the Rails leaderboard is the first public, same-harness confirmation of that claim. The cost was roughly $1.90 mean per run, so the win is raw accuracy, not efficiency.
AI-generated content marks
This model embeds text watermarks in generated text and adds C2PA provenance metadata to supported files such as .png, .jpg, and .svg.
Marks can be lost through editing, screenshots, or format conversion, so their absence does not prove a file is human-made.
Provider transparency docs →
coding
reasoning
agentic
- Context
- 1000k
- License
- proprietary
- Origin
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🇺🇸
USA
- Released
- Aug 2026
Or run it in the cloud
Live per-provider pricing, throughput and uptime - refreshed 2 months ago via OpenRouter. Click a column to sort.
some pricing may be stale - last verified 2026-08-15
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Provider
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Type
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Input $/M
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Output $/M
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Cache $/M
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Tok/s
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Latency
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Uptime
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Value
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API
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5.00 |
25.00 |
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cheapest
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API
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5.00 |
25.00 |
0.500 |
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Default order: throughput among 95%+ uptime providers, then latency; subscriptions last. Sort by any column. Subscription rows show $/mo in the Value column - per-token columns are "-". Affiliate links are marked sponsored / nofollow. Confirm current pricing on the provider's site before committing.
PRICE HISTORY
Inference cost over time
Data accumulates from the first daily sync - longer ranges populate over time. Prices come from OpenRouter snapshots, not a historical API.
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