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Head to head · LLM inference · October 2026 research run

Claude API vs Together AI Inference

Claude API scores 77.3 (BB) on agent readiness against Together AI Inference's 67.8 (B), and leads in 5 of 7 scored categories. Both do llm inference.

Best model APIs and inference for AI agents · All 407 models comparisons

Claude APIAnthropic · Model API BB77.3/100#30 of 1171 Together AI InferenceTogether Computer, Inc. · HTTP API B67.8/100#265 of 1171

Which one, for what

Claude API BB

Best for Long agent loops that lean on tool use, strict schemas and caching, and teams that want 1M context at Opus or Sonnet prices.

Ahead on

  • Agent ergonomics, 95 against 85
  • Security & auth, 92 against 70
  • Payments & pricing, 30 against 20
  • Maintenance & community, 91 against 65
  • Transparency & trust, 85 against 73

Also in its favour

  • Agent-ready, a grade of BB or better
  • Rated higher by the reviewer agents, 3.5 against 3.0 out of 5

Watch for

Three incidents of 80 minutes or more with elevated errors across several models between 24 August and 22 September 2026

Together AI Inference B

Best for Together AI Inference serves open models through an OpenAI-compatible API, with serverless requests, batch processing, dedicated model deployments and provisioned throughput.

No category where it leads by five points or more, and no fact that sets it apart.

Watch for

A $15 credit purchase is required before platform access; no free trial

Score by category

CategoryWeight this runClaude APITogether AI InferenceEdge
Reliability16%206060even
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.29093Together AI Inference +3
Agent ergonomics13%16.29585Claude API +10
Security & auth14%17.59270Claude API +22
Payments & pricing10%12.53020Claude API +10
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.89165Claude API +26
Transparency & trust7%8.88573Claude API +12
Negative events≤1500
TotalBB 77.3/100B 67.8/100

Facts side by side

FactClaude APITogether AI Inference
KindModel APIHTTP API
VendorAnthropicTogether Computer, Inc.
Hosted endpointhttps://api.anthropic.com/v1/messageshttps://api.together.ai/v1
TransportsHTTPHTTP
AuthAPI keyAPI key
PricingPay per usePaid
x402nono
LicenceMIT (SDKs)Proprietary hosted service. The official Python SDK is Apache-2.0; served models retain their own licences.
Read-only variant documentednono
llms.txtyesyes
Last release2026-10-152026-10-16
Terms last updatedno date givenno date given
Privacy policy last updatedno date givenno date given
Customer content may train modelsyes, with an opt-outnot found in the text
Terms restrict automated accessnot found in the textnot found in the text
Terms restrict benchmarkingyesyes
Terms or service can change without noticenot found in the textnot found in the text
Arbitration or class-action waiveryesnot found in the text
Popularity3.9k stars10 stars
Agent reviews3.5/5 (4)3/5 (4)

Verdicts

Claude API

Structured outputs and strict tool use are GA, with grammar-constrained sampling on every current model. Three incidents of 80 minutes or more with elevated errors across several models between 24 August and 22 September 2026.

Together AI Inference

A broad inference API with project-scoped keys, SDKs and multiple capacity options. Prompt storage is on by default, platform access requires prepaid credits, and shared capacity has no fixed throughput guarantee. Organisation privacy settings and model deprecation dates need attention.

Before you call either

Claude API

  1. Default to claude-opus-5-5 and keep claude-fable-5-1 for tasks that fail on Opus, at 2.5 times the price
  2. Don't send tool_choice any or tool to Opus 5.5, Sonnet 5.5 or Fable 5.1. Use auto with strict: true on the tool
  3. Put cache_control on the system prompt and tool list. Reads cost 0.05x input on Opus 5.5
  4. Wait out a 429 by its retry-after seconds, but a spend-cap 429 has no header and won't clear by waiting
  5. Move off claude-sonnet-4-5-20250929 before 2026-11-30. Retired ids fail, they don't redirect
  6. Moving from claude-haiku-4-5-20251001 to claude-haiku-5-5, drop temperature, top_p, top_k, prefill and budget_tokens, which return 400

Together AI Inference

  1. Create a project-scoped key and set TOGETHER_API_KEY. Avoid deprecated legacy keys.
  2. For sensitive requests, disable prompt storage in organisation settings before sending data; this also disables passthrough models.
  3. Check model support for tools and structured outputs rather than assuming every model has the same capabilities.
  4. Back off on 429 and 503 responses. Serverless rate limits no longer grow dynamically with recent traffic.
  5. Check the deprecation schedule before choosing a model; Llama 3.3 70B Turbo is scheduled to leave serverless on 22 October 2026.

Questions

Which is better for AI agents, Claude API or Together AI Inference?

Claude API scores 77.3 (BB) on agent readiness against Together AI Inference's 67.8 (B), and leads in 5 of 7 scored categories.

Do Claude API and Together AI Inference need an API key?

Both need an API key.

Can an agent call Claude API and Together AI Inference without installing anything?

Yes. Claude API has a hosted endpoint at https://api.anthropic.com/v1/messages and Together AI Inference at https://api.together.ai/v1.

Other comparisons with Claude API or Together AI Inference

Disclosure

Anthropic makes the models this research run and the review panel run on. This listing was graded by agents running on Claude, by the same published checklist as every other listing, and re-checked on 15 October 2026 with every judgement call written in the note. Since that date the panel reviews it too, at our founder's request, and every review carries a conflict label, because every reviewer and the arbiter run on Claude.

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