Claude Opus 5
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Anthropic Claude Opus 5 — current-generation Opus for agentic coding and long-horizon work.
- Context window
- 1M
- Max output
- 8K
- Input modalities
- text · image
- Output modalities
- text
- Capabilities
- Vision · Reasoning · Tool calling · Coding · Prompt cache · Strip Sampling Params
- Upstream release
- 2026-07-24
- RouteMux name
- anthropic/claude-opus-5
Try Claude Opus 5 here
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What is Claude Opus 5
Claude Opus 5 is Anthropic's current flagship model, built for work that runs long: multi-file refactors, agentic coding loops, and analysis that has to hold a large codebase or document set in view at once. It takes a 1M-token context window and vision input, and it is the model Anthropic positions for tasks where giving up halfway is worse than being slow.
Through RouteMux it costs $1.40 per 1M input tokens against Anthropic's $5, and $7 per 1M output against $25 — the same model and the same Anthropic Messages API, routed through one key alongside every other model in the catalog. Failed and timed-out requests are not billed, and prompt caching is priced separately at $0.14 read / $1.75 write per 1M tokens, which matters more on Opus than on cheaper models because the base rate is what caching is discounting.
Claude Opus 5 API pricing
Source: anthropic_x0.28 · Verified 2026-08-16
Cache read $0.14/M · Cache write $1.75/M
Estimate cost
Limited time20% extra Credits on your first top-up — up to 200 bonus Credits
Applies to your first top-up within 72 hours of signing up. Minimum $20, once per account.
Key capabilities
1M-token context
Enough to hold a mid-sized repository or a full document set in a single request, so long-horizon tasks do not need retrieval plumbing to get started.
Vision input
Accepts images alongside text — screenshots, diagrams, and scanned documents go in the same message as the prompt.
Tool calling
Native function calling, which is what makes the agentic loops it is built for possible without prompt-level hacks.
Prompt caching
Cache reads are $0.14 / 1M against a $1.40 base rate. On a long system prompt reused across a session this is where most of the saving actually comes from.
Interface and protocols
Use any of these IDs to call this model via the API.
anthropic/claude-opus-5Replace the ROUTEMUX_KEY placeholder with your API key. Create one →
from anthropic import Anthropic
client = Anthropic(
base_url="https://api.routemux.com/anthropic",
api_key="<ROUTEMUX_KEY>",
)
message = client.messages.create(
model="anthropic/claude-opus-5",
max_tokens=1024,
messages=[{"role": "user", "content": "What is the meaning of life?"}],
)
print(message.content[0].text)Performance (last 30 days)
Claude Opus 5 FAQ
›What is Claude Opus 5?
Anthropic Claude Opus 5 — current-generation Opus for agentic coding and long-horizon work.
›How large is the context window of Claude Opus 5?
Claude Opus 5 supports a context window of up to 1M tokens, with up to 8K output tokens per request.
›How much does the Claude Opus 5 API cost?
Through RouteMux, Claude Opus 5 costs $1.4 for input and $7 for output (USD per 1M tokens), below the official list price.
›How do I call Claude Opus 5 via API?
Claude Opus 5 is OpenAI-compatible: point your base URL at RouteMux and set the model field to anthropic/claude-opus-5 — no code changes needed.
›Which input and output modalities does Claude Opus 5 support?
Claude Opus 5 accepts text, image as input and produces text as output.
›When was Claude Opus 5 released?
Claude Opus 5 was released on July 24, 2026.
›Is this the same Claude Opus 5 as Anthropic's?
Yes — same model, same Anthropic Messages API surface. RouteMux routes your request through and bills your prepaid wallet instead of an Anthropic account.
›Does prompt caching work through RouteMux?
Yes. Cache read and cache write are billed separately at $0.14 and $1.75 per 1M tokens; the cache_control block goes in your request exactly as it would against Anthropic directly.
Sources
Reviewed by Jerry Fan on 2026-08-09