Staxly

Anthropic API vs LangSmith

API for Claude — frontier models for chat, tool use, agents, and long-context reasoning
vs. LLM observability, testing & evaluation — by LangChain

Anthropic website ↗LangSmith website ↗

Pricing tiers

Anthropic API

Opus 4.7 — usage
Input $5 / output $25 / cache-write $6.25 / cache-read $0.50 per 1M tokens. Batch = 50% off.
Custom
Sonnet 4.6 — usage
Input $3 / output $15 / cache-write $3.75 / cache-read $0.30 per 1M tokens. Batch = 50% off.
Custom
Haiku 4.5 — usage
Input $1 / output $5 / cache-write $1.25 / cache-read $0.10 per 1M tokens. Batch = 50% off.
Custom
Anthropic website ↗

LangSmith

Developer (Free)
Free forever. 5,000 traces/month. 14-day retention. 1 seat. Basic evaluations.
Free
Plus
$39/seat/month. 10k base traces included ($2.50 per 1k overage). Full evaluations, custom dashboards, email support.
$39/mo
Enterprise
Custom. Self-host option, SSO, custom retention, dedicated support.
Custom
LangSmith website ↗

Free-tier quotas head-to-head

Comparing opus-4-7 on Anthropic API vs developer on LangSmith.

MetricAnthropic APILangSmith
discount batch50 % off—

Features

Anthropic API · 0 features

    LangSmith · 14 features

    • Alerts — Threshold alerts on latency, cost, eval metrics.
    • Annotation Queues — Human-review workflows for trace quality rating.
    • Custom Dashboards — Aggregate metrics dashboards per project/tag.
    • Datasets — Collect examples → use as eval sets or training data.
    • Evaluations — LLM-as-judge, embedding similarity, custom Python evaluators, offline batch eval…
    • LangChain Integration — Auto-trace any LangChain/LangGraph run with env var.
    • LangGraph Integration — First-class trace + eval for LangGraph agents.
    • LLM Tracing — Automatic trace every LLM call + tool call + chain step.
    • OpenTelemetry Export — Export traces as OTLP to Datadog/Honeycomb/etc.
    • Playground — Test prompts + models inline before deploying.
    • Prompt Canvas — Visual prompt editor with live test + eval.
    • Prompt Hub — Public + private prompt library with versioning.
    • Self-Hosted (Enterprise) — Docker + k8s deployment in your infra.
    • Threads + Sessions — Group traces into conversational sessions.

    Developer interfaces

    KindAnthropic APILangSmith
    CLIClaude Code CLILangSmith CLI
    SDKGo SDK, Java SDK, Python SDK, Ruby SDK, TypeScript SDK (@anthropic-ai/sdk)langsmith-js, langsmith-python
    RESTAWS Bedrock, Google Vertex AI, Microsoft Azure AI, REST API (Messages + Agents)LangSmith REST API
    MCP—LangSmith MCP
    OTHER—LangSmith Dashboard
    Staxly is an independent catalog of developer platforms. Outbound links to Anthropic API and LangSmith are plain references to their official websites. Pricing is verified against vendor pages at publication time — reconfirm before buying.

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