$ diff claude-opus-5-5 inkling
Claude Opus 5.5 vs Inkling
Values come from Claude Opus 5.5 and Inkling, where each is cited to its source. This page states no benchmark result and ranks neither model — it puts two published specifications next to each other. Where a lab has not published a figure, the row says so rather than guessing.
AnthropicClaude Opus 5.5
- context
- 1M
- weights
- closed
- $/M in
- $4
- $/M out
- $20
- context
- 1M
- weights
- open
- $/M in
- —
- $/M out
- —
What actually differs
- Context window
- Identical — both accept 1M tokens, so context length is not a reason to pick either.
- Weights
- Inkling publishes weights (Apache 2.0 (open-weight)); Claude Opus 5.5 is API-only. That decides self-hosting, air-gapped deployment and fine-tuning before any capability question does.
- Recency
- Claude Opus 5.5 shipped 69 days after Inkling (2026-09-22 vs 2026-07-15).
Full spec
| Attribute | Claude Opus 5.5 | Inkling |
|---|---|---|
| Developer | Anthropic | Thinking Machines |
| Released | 2026-09-22 | 2026-07-15 |
| Context window | 1M tokens | 1M |
| Pricing | $4/M input · $20/M output · cache reads $0.20/M · cache writes $5/M | not recorded |
| License | proprietary (API-only; no weight release) | Apache 2.0 (open-weight) |
| Availability | Claude apps, Claude Code, Claude API as `claude-opus-5-5`, Amazon Bedrock, Google Cloud Vertex AI, Microsoft Foundry | Hugging Face (BF16 and NVFP4), Tinker (fine-tuning), SGLang, vLLM, llama.cpp, Unsloth |