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Limited-time 80% discount via Inception through September 8, 2026 at 07:00 UTC.

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Inception: Mercury 2.5 Preview

inception/mercury-2.5-preview

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Mercury 2.5 is the fastest reasoning LLM, and the latest diffusion LLM (dLLM) from Inception. Instead of generating tokens sequentially, Mercury 2.5 produces and refines multiple tokens in parallel, achieving 1,107 tokens/sec on standard GPUs. It delivers a 10+ point jump in intelligence over Mercury 2, comparable quality to cost-optimized frontier models like GPT-5.6 Luna (Low), Gemini 3.5 Flash-Lite, and Claude Haiku 4.5. Mercury 2.5 supports tunable reasoning levels, parallel tool calls, and schema-aligned JSON output. It's built for production workloads where latency compounds: search agents, voice pipelines, and coding subagents.

Modalities

In / Out Price

80% off

$0.04 / $0.15per 1M

Context

260K

Released

Aug 31, 2026

Compare
ProvidersPricingPerformanceUptimeAppsActivityFAQExplore

Providers

This model is hosted by one provider. OpenRouter forwards every request to it directly — no routing decisions to make.

Pricing

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.

Performance

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

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.

Apps

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.

Activity

Token volume and request traffic to this model over time.

Quick Start

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.

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80% off
$0.20$0.04$0.75$0.15$0.02$0.0041.17s141 tps
100.00%

Throughput

141tok/s

P50, best across providers

Latency

1.17s

P50, best provider

Uptime (3d)

100.00%

Availability (3d)

96.61%

Availability over the last 3 days

Last 72 hours
Availability 96.61%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
96.58%

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.

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Frequently asked questions

Mercury 2.5 is the fastest reasoning LLM, and the latest diffusion LLM (dLLM) from Inception. Instead of generating tokens sequentially, Mercury 2.5 produces and refines multiple tokens in parallel, achieving 1,107 tokens/sec on standard GPUs.

Mercury 2.5 Preview costs $0.04/M input tokens and $0.15/M output tokens, with separate rates for Cache Read at $0.004/M tokens.

Mercury 2.5 Preview has a 260,000 token context window. It supports up to 65,536 completion tokens.

Yes. Mercury 2.5 Preview accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

Mercury 2 is another text model from Inception.

Mercury 2.5 Preview was released on August 31, 2026.