Migrate from Sonar to the Agent API

The Agent API is more performant and cost-effective for production workloads. It features Perplexity’s latest innovations in search and reasoning technology, including Search as Code and tuned effort levels.

We recommend:

Migrating existing Sonar Chat Completions usage to the Agent API.
Using the Agent API for all new projects.

Sonar Chat Completions support ended on September 27, 2026. Synchronous and streaming requests keep working: they are being reformulated as Agent API requests, rolling out gradually by model. Asynchronous Sonar requests are not reformulated and are no longer supported; move them to background mode.

About the Agent API

Agent API is a unified interface for building powerful agent applications. It contains:

One API to call all the leading frontier and open-source models.
Built-in tools such as web search, URL fetching, sandboxes, and MCP, plus premium data sources like finance and people search.
Research-backed configurations for agentic workflows, based on specific task intensity (fast, low, medium, high, xhigh — effort levels).
Compatibility with the Open Responses standard to ensure portability and avoid lock-in — we want to win your business on performance and efficiency, not on locking you in with exorbitant migration costs.
Seamless multi-turn interactions that let you pass previous responses for higher-accuracy reasoning.

Why migrate

Agent API contains several benefits over Sonar Chat Completions:

Full flexibility to select across the OpenAI, Anthropic, Google, xAI, Z.AI, Moonshot AI, and NVIDIA model families, in addition to Perplexity’s Sonar model.
The ability to leverage multiple tools and spin up an agentic loop that reasons, acts, observes results, and continues within a single request.
A secure sandbox to run generated code — compute results, analyze data, and verify outputs without leaving the request.
Connect external servers with MCP or define your own custom functions to extend the agent with your tools and private data.

Sonar vs Agent API

Capability	Sonar API	Agent API
Leading frontier and open-source models
Built-in web search
People Search
Finance Search
Code sandbox
MCP servers
Model fallback
Structured outputs
Streaming
Async mode

Both call a model but shape the request differently. Sonar takes a messages array and returns choices. The Agent API takes an input and returns a typed output array — one item per step the model took, with a message item for the answer text and a search_results item for the sources.

Sonar

from perplexity import Perplexity

client = Perplexity()

completion = client.chat.completions.create(
    model="sonar",
    messages=[{"role": "user", "content": "What are the latest developments in AI agents?"}]
)
print(completion.choices[0].message.content)

import Perplexity from '@perplexity-ai/perplexity_ai';

const client = new Perplexity();

const completion = await client.chat.completions.create({
  model: 'sonar',
  messages: [{ role: 'user', content: 'What are the latest developments in AI agents?' }]
});
console.log(completion.choices[0].message.content);

curl https://api.perplexity.ai/v1/sonar \
  -H "Authorization: Bearer $PERPLEXITY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "sonar",
    "messages": [
      {"role": "user", "content": "What are the latest developments in AI agents?"}
    ]
  }' | jq

Agent API

from perplexity import Perplexity

client = Perplexity()

response = client.responses.create(
    effort="fast",
    input="What are the latest developments in AI agents?"
)
print(response.output_text)

import Perplexity from '@perplexity-ai/perplexity_ai';

const client = new Perplexity();

const response = await client.responses.create({
  effort: 'fast',
  input: 'What are the latest developments in AI agents?'
});
console.log(response.output_text);

curl https://api.perplexity.ai/v1/agent \
  -H "Authorization: Bearer $PERPLEXITY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "effort": "fast",
    "input": "What are the latest developments in AI agents?"
  }' | jq

Sonar response
Agent API response

{
  "id": "8158ec84-87a8-40fd-8720-a8b8e628708c",
  "choices": [
    {
      // ...
      "message": {"content": "The latest developments in AI agents (as of July 2026) center on **massive model upgrades**, **open-source toolkits**, **real-world autonomous transactions**, and **enterprise-grade security frameworks** ...", "role": "assistant"},
      "finish_reason": "stop"
    }
  ],
  "created": 1784292153,
  "model": "sonar",
  "citations": [
    "https://medium.com/@agencyai/this-weeks-ai-agent-roundup-20-launches-and-updates-you-shouldn-t-miss-401202306f62",
    "https://www.itechmagazine.com/ai-agents-news/"
    // ...
  ],
  "object": "chat.completion",
  "search_results": [
    {"title": "AI Agents News 2026: What's Happening Right Now and Why It ...", "url": "https://www.itechmagazine.com/ai-agents-news/", "date": "2026-06-14", "last_updated": "2026-06-21", "snippet": "Amazon Web Services open-sourced its Strands Agents SDK, a toolkit that helps developers b ...", "source": "web", "place_metadata": null}
    // ...
  ]
  // ...
}

{
  "id": "resp_18690c07-7c56-48fa-85a3-fd22e34df694",
  "created_at": 1784292159,
  "model": "openai/gpt-5.6-luna",
  "object": "response",
  "output": [
    {
      "results": [
        {"id": 1, "snippet": "This transition from one-shot intelligence to endurance, from conversational AI to genuine autonomy ...", "title": "State of AI Agents 2026: Autonomy is Here", "url": "https://www.prosus.com/news-insights/2026/state-of-ai-agents-2026-autonomy-is-here", "date": "2026-02-26", "last_updated": "2026-07-12", "source": "web"}
        // ...
      ],
      "type": "search_results"
      // ...
    },
    {
      "id": "msg_525b46ea-4e33-400b-add0-6862a48549b9",
      "content": [
        {"text": "The latest developments in AI agents are centered on **greater autonomy, better orchestration, and stronger enterprise controls**[1][3] ...", "type": "output_text", "annotations": []}
      ],
      "role": "assistant",
      "status": "completed",
      "type": "message"
    }
  ],
  "status": "completed"
  // ...
}

How Sonar Chat Completions maps to Agent API effort levels

While performance improvements will vary by individual use-case, our internal benchmarks indicate performance improvements across the below comparable Sonar Chat Completions and Agent API effort level mappings.

Sonar Chat Completions	Agent API effort level	Best for	What improves
Sonar	`fast`	Single-fact lookups, definitions, quick summaries.	More accurate than Sonar, with the clearest gains on research-style, multi-step questions.
Sonar Pro	`fast`	Everyday research questions, light multi-step lookups with current information.	Much more accurate, and unlocks the real multi-step, agentic research that Sonar Pro can’t reach.
Sonar Reasoning Pro	`low`	Multi-hop browsing and wide aggregation across many sources.	Far stronger on step-by-step reasoning and on chaining evidence across several rounds of search.
Sonar Deep Research	`high`	Expert-level reasoning and exhaustive source coverage.	The most accurate tier on demanding expert-level and deep-research work, and often at a lower per-request cost than Sonar Deep Research.

For state-of-the-art deep research, use the xhigh effort level — the highest quality in the lineup, leading across the benchmarks we run.

See Choosing an effort level for what each effort level is best for, and the benchmarks page for the scores.

Getting Started

Orchestrator API

Agent API

Search API

Embeddings API

Decisions API

Perplexity SDK

Admin & Management

Resources

Migrate from Sonar to the Agent API

About the Agent API

Why migrate

Sonar vs Agent API

How Sonar Chat Completions maps to Agent API effort levels

Continue your migration

How to migrate

Explore the effort levels

​About the Agent API

​Why migrate

​Sonar vs Agent API

​How Sonar Chat Completions maps to Agent API effort levels

​Continue your migration

How to migrate

Explore the effort levels

About the Agent API

Why migrate

Sonar vs Agent API

How Sonar Chat Completions maps to Agent API effort levels

Continue your migration