Fast-mode variant of Opus 4.8 - identical capabilities with higher output speed at 2x pricing relative to regular Opus 4.8.
Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode(opens in new tab)
Modalities
In / Out Price
$10 / $50per 1M
Context
1M
Released
May 27, 2026
This model is hosted by one provider. OpenRouter forwards every request to it directly — no routing decisions to make.
The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.
Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).
Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.
Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.
Token volume and request traffic to this model over time.
Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.
Fast-mode variant of Opus 4.8 - identical capabilities with higher output speed at 2x pricing relative to regular Opus 4.8. Learn more in Anthropic's docs: https://platform.claude.com/docs/en/build-with-claude/fast-mode(opens in new tab)
Claude Opus 4.8 (Fast) costs $10.00/M input tokens and $50.00/M output tokens, with separate rates for Cache Read at $1.00/M tokens, Cache Write at $12.50/M tokens, Cache Write (1h) at $20.00/M tokens and Web Search at $10.00/1K calls.
Claude Opus 4.8 (Fast) has a 1,000,000 token context window. It supports up to 128,000 completion tokens.
Yes. Claude Opus 4.8 (Fast) accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.
Claude Opus 4.8 (Fast) accepts text, images and files such as PDFs as input and returns text.
Claude Opus 5 (Fast), Claude Opus 5, Claude Sonnet 5 and 13 more are other text models from Anthropic.
Claude Opus 4.8 (Fast) was released on May 27, 2026.
| $10.00 | $50.00 | $1.00 | 1.13s | 105 tps |
Throughput
105tok/s
P50, best across providers
Latency
1.13s
P50, best provider
100.00%
99.92%
When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and customization options.
