Claude Opus 4.5
claude-opus-4-5claude-opus-4.5opus-4-5opus-4.5- 🏢 Anthropic frontier reasoning model, released December 2025.
- 🧠 Built for complex software engineering and long-horizon agentic work.
- 👁️ Multimodal: handles text and image inputs.
- 📏 Roughly 200K-token context window for extended sessions.
- 🔧 Supports function calling, tool use, and extended thinking.
- 🔒 Anthropic reports improved robustness to prompt injection.
- 🌐 Includes web search and computer-use capabilities.
- ⚡ Sustains performance through long autonomous coding runs.
Anthropic PBC is an American artificial intelligence company headquartered in San Francisco. Structured as a public benefit corporation, the lab develops large language models under the Claude name, with a research emphasis on building reliable, steerable, and safety-focused AI…
Explore 12 more models by Anthropic →Claude Opus 4.5 is Anthropic's frontier reasoning model in the Opus line, positioned for complex software engineering, agentic workflows, and long-horizon computer use across browsers, desktops, and spreadsheets. It accepts text and image inputs, supports tool calling and extended thinking, and works with roughly a 200K-token context window, with new tooling for longer-running agents and integrations for Excel, Chrome, and desktop use.
Against earlier Opus generations, Anthropic's system card reports its best internal results on software coding and agentic tasks among its own evaluated frontier models, alongside substantial improvements in reasoning and mathematics. Anthropic also describes measurable gains on its hardest internal evaluations and consistent behavior through roughly 30-minute autonomous coding sessions, framing it as a clear step beyond [[sibling:claude-sonnet-4-5|Claude Sonnet 4.5]] for sustained, multi-step execution.
The model is the foundation for several later releases. Anthropic's [[sibling:claude-opus-4-6|Claude Opus 4.6]] system card characterizes that successor as an upgrade—sometimes substantial—on Opus 4.5, citing improvements in long-context reasoning, knowledge work, research, and some areas of agentic coding and tool use. The lineage continues through to [[sibling:claude-opus-4-8|Claude Opus 4.8]], which Anthropic's docs describe as its most capable generally available model with a 1M-token context window.
In short, Opus 4.5 marked a step toward more reliable, lower-overhead long-horizon autonomy, emphasizing structured planning, tool orchestration, and execution reliability over prior Opus models, while remaining a strong general-purpose reasoning and coding option.
This About section is AI-generated from public sources via VeniceStats + Venice inference, with no human editing. It may contain inaccuracies.
| Seller | Reputation↓ | Routing | Input $/M | Cached $/M | Output $/M | Categories | API |
|---|---|---|---|---|---|---|---|
| Venice.ai Proxy 0x1f22…18c9 | 99 | #3 | $3.00 | $0.30 | $15.00 | chat,reasoning,coding,vision,multimodal,web-search | openai-chat-completions |
| ▲ Apex Ant 0x73b4…e736 | 83 | #1 | $0.8248 | $0.27 | $4.1238 | chat,reasoning,premium,vision,multimodal,long-context,writing,agents,tasks,creative | openai-chat-completions |
| Open Ant 0xe4f6…5bc4 | 74 | #4 | $3.90 | $0.39 | $19.50 | chat,coding,reasoning,vision,multimodal,tools | openai-chat-completions |
| surplusintelligence.ai 0x0e49…8927 | 68 | #2 | $1.80 | $0.18 | $9.00 | agents,chat,cheap,code,coding,developer,frontier,function-calling,multimodal,reasoning,research,tasks,tools,vision,web-search | openai-chat-completions |
| antseed-aggregator 0x8564…b8b4 | 67 | gated | $4.50 | $4.50 | $22.00 | chat,coding | openai-chat-completions |
| NovaRoute AI 0xc50d…ed7b | 60 | gated | $0.9164 | $0.9164 | $4.582 | chat,coding,code,reasoning,tasks,premium,claude,value,surplus,openai-compatible,low-cost,verified,github,response-auth,base-usdc,monitored | openai-chat-completions |
| Super Seeder 0xd19f…41f3 | 40 | gated | $3.00 | $0.30 | $15.00 | chat,coding,reasoning,vision,multimodal,tools | openai-chat-completions |
| Fire Ant 🔥🐜 0xbe05…bc5d | 37 | gated | $5.2436 | $0.54 | $26.2181 | base-usdc,chat,claude,code,coding,github,json,low-cost,math,monitored,openai-compatible,premium,reasoning,response-auth,surplus,tasks,tools,value,verified | — |
| Meridian AI 0x8c8c…06f5 | 22 | gated | $1.0157 | $1.0157 | $5.0787 | chat,coding,reasoning | openai-chat-completions |
| antseed-neon-puma-944e 0x6650…944e | 3 | gated | $2.046 | $0.60 | $10.23 | chat,coding,math | openai-chat-completions |
| antseed-opal-badger-2580 0xc85d…2580 | 1 | gated | $3.00 | $3.00 | $15.00 | chat | openai-chat-completions |
| Leftermute 0x388b…5389 | 0 | gated | $3.03 | $3.03 | $15.15 | chat,coding,json,reasoning,tools | openai-chat-completions |
| Apex TEE Test 0xe672…7955 | 0 | gated | $2.70 | $2.70 | $13.50 | chat,reasoning,premium,vision,multimodal,long-context,writing,agents,tasks,creative | openai-chat-completions |
"Best price" and the seller table are live AntSeed catalog data (advertised $/1M tokens — or $ per generated image for unit-billed image models — not settled amounts). Reputation = on-chain trust (0-100). "Routing" = the SDK's default buyer routing (what the VPR desktop app ships with): a trust ≥ 60 gate on the effective reputation, then cheapest-first among routable sellers; live failover state (per-peer cooldowns) is buyer-side runtime and not included. Model knowledge (TLDR, provider, About) via the VeniceStats enrichment layer. Advertised catalog, not the model used in any specific purchase. "Usage on AntSeed" counts only settlements whose buyers share the per-model split on-chain (metadata v2/v3, opt-in), so every usage figure is a lower bound.