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Choose an AI agent by testing it on representative work from your own workflow—not by picking the model with the highest headline score. Compare the whole system: output quality, tools, execution environment, data access, oversight, recovery from mistakes, and the time and cost of running it. The right choice may differ for research, coding, and business tasks; the evidence does not establish one universal best agent.

What counts as an AI agent?

An AI agent is a system in which an AI model directs its own process and tool use to accomplish a goal. It may plan, take an action, observe the result, adjust, and continue until it finishes or needs human input. The model is only one part of that system: instructions and guardrails, tools, context, and the runtime in which actions occur also shape what the agent can do. Anthropic describes this agent loop and its practical implications.

For developers choosing how to build rather than buy, OpenAI documents three starting points: a managed Agents API for long-running tasks, an Agents SDK for custom tools and workflows in an application, and the Responses API for direct model calls or a more self-built integration. They involve different choices about where the agent runs, how state is stored, how tools execute, and how much implementation work is required. OpenAI’s agent documentation outlines these options.

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How to choose an agent for research, coding, or business work

Begin with the work the agent must complete, then define what a good result looks like and what evidence or controls you need to trust it. A tool that performs well on a polished demonstration may still fail when it encounters your sources, repository, or approval process.

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Research: judge the trail behind the answer

Give a candidate a multi-step investigation similar to work you actually need. Check whether it can form a useful plan, find relevant material, keep claims tied to sources, handle conflicts between sources, and produce a synthesis that a person can audit. Google’s Gemini documentation describes Deep Research as an autonomous agent for planning, executing, and synthesizing work such as market analysis, due diligence, and literature reviews. See Google’s Gemini agent documentation.

Do not treat a vendor benchmark as a general ranking. OpenAI’s product announcement reports a 68.9% result for ChatGPT Agent on BrowseComp, 17.4 percentage points above Deep Research in that evaluation. That is a vendor-reported result for a particular task set, model, and evaluation setup; it does not establish which agent will be best for your research questions. OpenAI’s announcement describes the benchmark claim.

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Coding: use a real issue from the repository

Test the agent on a representative issue in the codebase, not a toy prompt. See whether it can inspect the repository, use the required terminal, editor, and runtime, make a suitably small change, run tests, explain failures, and leave a diff a developer can review. Also check for a persistent workspace and assess sandboxing, network access, and the scope of any repository credentials. Managed and application-controlled execution arrangements can differ; OpenAI’s documentation describes several implementation approaches.

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Read coding scores with their test setup attached. OpenAI’s system card describes SWE-bench Verified as a fixed subset of 477 validated tasks, and also describes a pull-request evaluation graded with hidden tests. Neither evaluation establishes dependable performance on an arbitrary codebase or issue. OpenAI’s system card documents these evaluations.

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Business tasks: define allowed actions and approval points

Start with one concrete workflow, such as drafting a customer response, preparing an expense report, or updating a record. Specify which systems and data the agent needs, what it may change or send, what requires approval, how it should respond to missing information, and how an operator can inspect or undo its work. In an Anthropic example, an agent encountering an unknown expense cap pauses to ask whether it should retrieve the policy before continuing. That is the kind of uncertainty-handling behavior to test against your own workflow. Anthropic’s article discusses the example and agent design.

For sensitive records or external systems, inspect the actual permissions and network configuration rather than relying on a product label. Google’s managed agents documentation says the service is in Public Preview and advises reviewing actions and outputs before sensitive workflows. It also says outbound network access is unrestricted by default unless restricted with an allowlist, and recommends trusted tools, minimum required permissions, and carefully scoped credentials. Review Google’s documentation for the service’s current configuration guidance.

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Compare the whole system, not just its model

Use the same rubric for each candidate, but weight the criteria according to the task. A research agent needs an auditable evidence trail; a coding agent needs a reviewable change and useful test results; a business agent needs safe boundaries and a clear record of actions.

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Selection axis What to examine
Task quality Correctness and completeness on a representative set of your real tasks.
Evidence and inspectability Visible sources for research, diffs and test output for code, or audit records for business actions.
Tool and integration fit Access to the browsers, repositories, files, APIs, and business applications the workflow actually requires.
Execution and data boundaries Whether the service is managed or runs in your environment; sandboxing, network policy, and credential scope.
Control and recovery Approval gates, ability to interrupt the agent, escalation when uncertain, rollback, and how it handles errors.
Reliability and operating cost Successful completion, retries, latency, usage charges, setup, human review, and the cost of mistakes.

There is no comparable current price table established across providers in the cited material. Check vendor pricing directly when evaluating candidates, and include implementation, monitoring, retries, and human oversight in your estimate. A low usage charge does not by itself mean the workflow is inexpensive if setup or correction takes substantial staff time.

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When should you use one agent or several?

Do not assume that adding agents improves results. A Google Research report published January 28, 2026, describes a controlled evaluation of 180 agent configurations and finds that outcomes depend on task structure and architecture: coordination can help with parallelizable work and harm some sequential tasks. In the studied configurations, the report illustrates results of +81% on Finance-Agent and -70% on PlanCraft. Those figures apply to the reported benchmarks and configurations, not to every multi-agent deployment. Read the Google Research report.

Start with the simplest configuration that meets the workflow’s requirements. Consider multiple agents only when work can be divided into genuinely independent parts, and measure whether parallel work improves the result after coordination overhead is counted.

How to run a useful pilot

  1. Choose representative work. Select a small set of tasks from the intended category and write a pass/fail rubric before trying products.
  2. Keep the comparison fair. Run the same tasks under comparable conditions. Preserve the prompts, outputs, tool settings, and model or version details.
  3. Score the work that matters. Assess correctness, completeness, source or test quality, time saved after human review, and how well the agent recovers from mistakes.
  4. Test controls with limited access. Use least-privilege permissions. Check approval gates, whether the agent can be stopped, and whether actions can be rolled back.
  5. Calculate operating cost. Include successful runs, retries, setup, monitoring, and human correction—not just usage charges.
  6. Choose the simplest workable setup. Add agent coordination only when independent parallel work may help and you can measure the cost of coordinating it.

Use benchmarks and safety disclosures as evidence, not verdicts

Benchmarks can help identify capabilities worth testing, but they do not substitute for a workflow pilot. A relevant caution appears in OpenAI’s ChatGPT Agent system card: it says the system “does not demonstrate improved performance on software engineering and AI research tasks relevant to AI self-improvement risks.” That statement is limited to the evaluated tasks and comparison in that system card; it is not a claim that the product cannot help with ordinary coding or research. Read the system card in context.

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Public safety information is also uneven. The MIT-led 2025 AI Agent Index, published for FAccT ’26, found that 25 of the 30 indexed agents disclosed no internal safety results, and 23 of 30 had no third-party testing information; the paper reports documented third-party testing for 3 of 30. These counts describe the Index’s sample and annotation method, not every agent on the market. Treat missing public information as a reason to ask vendors specific questions about testing, permissions, incident handling, and oversight—not as proof that a particular system is unsafe. Read the AI Agent Index paper.

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