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Anthropic vs Boundless
Anthropic sells Claude direct and through the major clouds. Boundless resells Claude Opus 5.5 and Fable 5.1 at Anthropic's list prices beside open models.
By The Subconscious Team · Updated
Anthropic vs Boundless: key differences
Anthropic's lineup runs from Claude Fable 5.1 at $10 in and $50 out per million tokens down to Haiku 5.5 at $0.10 in and $0.50 out, with a 1M window on every tier, cheap cache reads and Batch at 50% off. It sells through its own API, Bedrock, Vertex AI and Microsoft Foundry. Boundless resells Claude Opus 5.5 at $4 in and $20 out and Fable 5.1 at $10 in and $50 out, matching Anthropic's list prices, plus Claude Opus 5 at $5 in and $25 out. Its open models run from DeepSeek V4 Flash at $0.04 in and $0.21 out to Kimi K3 at $2.30 in and $11.40 out, and its API works with both the Anthropic and OpenAI SDKs.
Anthropic is the pick for Sonnet 5.5 and Haiku 5.5 and for buying Claude through AWS, Google or Microsoft. Boundless fits teams that want Claude and open models such as GLM-5.3 behind one Anthropic compatible endpoint, so a coding agent can switch between them by model name. Its tailored tier adds engineers who pick an open model on your evals and run it against contracted latency targets. Boundless keeps zero data retention and processes requests in the US or Europe.
What Anthropic and Boundless do
Anthropic
Anthropic sells the Claude family of closed models through its own API, Amazon Bedrock, Google Vertex AI and Microsoft Foundry. The public lineup today runs from Claude Fable 5.1 at the top, released September 1, 2026, through Opus 5.5 ($4 in, $20 out) and Sonnet 5.5 ($2 in, $10 out) down to Haiku 5.5. List prices span a hundredfold range, from $10 in and $50 out on Fable to $0.10 in and $0.50 out on Haiku. All four tiers have a 1M token context window. The top three bill it at standard pricing, while Haiku 5.5 charges more past 100K.
Example models: Claude Fable 5.1, Claude Opus 5.5, Claude Haiku 5.5
Full Anthropic profileBoundless
Boundless launched in September 2026 as an inference partner for AI-native startups. It sells two things. The Model API serves pre-tuned models on shared capacity, billed per token from prepaid credits with a budget per API key. Tailored inference reserves capacity for one customer, and Boundless engineers pick the model on the customer’s own evals, tune precision, batching, caching, speculative decoding and parallelism, then run the deployment against uptime, throughput and latency targets written into the contract. A free two-week evaluation tests those targets on real traffic against the customer’s current provider first.
Example models: GLM-5.3, DeepSeek V4.1 Flash, Kimi K3
Full Boundless profileShould you choose Anthropic or Boundless?
Anthropic vs Boundless at a glance
| Attribute | Anthropic | Boundless |
|---|---|---|
| Model access | Closed | Open weights, plus closed GPT and Claude |
| Flagship models | Claude Fable 5.1, Opus 5.5, Sonnet 5.5, Haiku 5.5 | GLM-5.3, DeepSeek V4.1 Flash, Kimi K3 |
| Speed | Fable is the slowest tier | 342 tok/s on DeepSeek V4.1 Flash 1017 (Vercel) |
| Price | $0.10–$10 in, $0.50–$50 out per 1M | $0.04–$2.30 in, $0.21–$11.40 out per 1M (open) |
| Customization | N/A | Serving-stack tuning, no fine-tuning |
| Deployment | API, Bedrock, Vertex AI, Microsoft Foundry | Serverless API, reserved tailored capacity |
| Long context | 1M; Haiku 5.5 costs more past 100K | 1M context on most models |
Frequently asked questions
What is the difference between Anthropic and Boundless?
Anthropic sells Claude direct and through the major clouds. Boundless resells Claude Opus 5.5 and Fable 5.1 at Anthropic's list prices beside open models.
When should I choose Anthropic over Boundless?
The full Claude lineup with Batch discounts; Claude through AWS, Google or Microsoft; Cheap cache reads for agent loops.
When should I choose Boundless over Anthropic?
Claude and open models on one API; Anthropic SDK code on open models; Zero data retention in the US or Europe.
Is Anthropic or Boundless cheaper?
Anthropic: $0.10–$10 in, $0.50–$50 out per 1M. Boundless: $0.04–$2.30 in, $0.21–$11.40 out per 1M (open). The cheaper choice depends on the model and workload.
Which has more context, Anthropic or Boundless?
Anthropic: 1M; Haiku 5.5 costs more past 100K. Boundless: 1M context on most models.
Related comparisons
Running long-horizon agents?
If your agents run past 200K tokens, compare both against Subconscious. Our inference stack treats a long-horizon trace as the primary workload, so speed, cost, and accuracy hold up deep into the trace.