Compare / head-to-head
Claude Sonnet 5.5vs
Inkling-Small
Claude Sonnet 5.5 leads 12 of 12 shared benchmarks. Inkling-Small is 8x cheaper per token. Both offer a 1M-token context window.
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
12 – 0
Claude Sonnet 5.5 leads
Cheaper per token
Inkling-Small
8x cheaper, input + output
Larger context
Tie
both 1M tokens
Providers
2 providers
Anthropic · Thinking Machines Lab
Claude Sonnet 5.5
Anthropic · released 2026-09-28
textvision
Inkling-Small
Thinking Machines Lab · released 2026-07-30
textvisionaudio
Quality
Benchmark matrix
12 shared · 17 only Claude Sonnet 5.5 · 16 only Inkling-Small| Benchmark | Claude Sonnet 5.5 | Inkling-Small | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 12 | ||||
| GPQA Diamond | 95.6% ↗epoch run | 88.5% ↗epoch run | +7.1 pt | Claude Sonnet 5.5 |
| LMArena Elo | 1471 ↗ | 1405.2 ↗ | +65.8 | Claude Sonnet 5.5 |
| FrontierMath Tier 4 v2 (Epoch AI run) | 80.5% ↗epoch run | 17.1% ↗epoch run | +63.4 pt | Claude Sonnet 5.5 |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 88.8% ↗epoch run | 46.3% ↗epoch run | +42.5 pt | Claude Sonnet 5.5 |
| LMArena Agent (LMArena) | 0.1252 ↗ | -0.1033 ↗ | +0.2 | Claude Sonnet 5.5 |
| LMArena Vision (LMArena) | 1268.3 ↗ | 1206.3 ↗ | +62 | Claude Sonnet 5.5 |
| LMArena WebDev (LMArena) | 1786.3 ↗ | 1408.2 ↗ | +378.1 | Claude Sonnet 5.5 |
| Mystery Game Puzzles (Epoch AI run) | 65% ↗epoch run | 6% ↗epoch run | +59 pt | Claude Sonnet 5.5 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 100% ↗epoch run | 90% ↗epoch run | +10 pt | Claude Sonnet 5.5 |
| SAGE (Vals AI) | 51.8% ↗ | 32.7% ↗ | +19.1 pt | Claude Sonnet 5.5 |
| SimpleQA Verified | 46.5% ↗epoch run | 20.6% ↗ | +25.9 pt | Claude Sonnet 5.5 |
| Terminal-Bench 4.0 (Vals AI) | 64.1% ↗ | 0% ↗ | +64.1 pt | Claude Sonnet 5.5 |
| Only Claude Sonnet 5.5 reports · 17 | ||||
| APEX-Agents (Mercor) | 75.5% ↗ | not reported | — | — |
| Chartography (no tools) | 61.6% ↗ | not reported | — | — |
| CursorBench 4.0 | 55.5% ↗ | not reported | — | — |
| FrontierCode v1.1 (Main) | 46.2% ↗ | not reported | — | — |
| FrontierSWE V2 (Proximal Labs) | 61.9% ↗ | not reported | — | — |
| Furniture Assembly (Epoch AI run) | 75% ↗epoch run | not reported | — | — |
| Humanity's Last Exam (with tools) | 64.5% ↗ | not reported | — | — |
| LiveBench Agentic Coding (LiveBench) | 56.3% ↗ | not reported | — | — |
| LiveBench Coding (LiveBench) | 91.4% ↗ | not reported | — | — |
| LiveBench Data Analysis (LiveBench) | 78.6% ↗ | not reported | — | — |
| LiveBench Instruction Following (LiveBench) | 70.5% ↗ | not reported | — | — |
| LiveBench Language (LiveBench) | 83.4% ↗ | not reported | — | — |
| LiveBench Mathematics (LiveBench) | 96.7% ↗ | not reported | — | — |
| LiveBench Reasoning (LiveBench) | 91.6% ↗ | not reported | — | — |
| OSWorld 2.1 (partial) | 80.1% ↗ | not reported | — | — |
| SimpleBench (SimpleBench) | 75.9% ↗ | not reported | — | — |
| Terminal-Bench 4.0 | 70.6% ↗ | not reported | — | — |
| Only Inkling-Small reports · 16 | ||||
| SWE-bench Verified | not reported | 80.2% ↗ | — | — |
| AIME 2026 | not reported | 95.5% ↗ | — | — |
| ARC-AGI-1 | not reported | 84% ↗ | — | — |
| ARC-AGI-2 | not reported | 40.1% ↗ | — | — |
| BrowseComp (with context management) | not reported | 77.4% ↗ | — | — |
| CharXiv RQ | not reported | 77.4% ↗ | — | — |
| CharXiv RQ (with python) | not reported | 81.3% ↗ | — | — |
| Chess Puzzles (Epoch AI run) | not reported | 18% ↗epoch run | — | — |
| HMMT Feb 2026 | not reported | 90.2% ↗ | — | — |
| IFBench | not reported | 82.2% ↗ | — | — |
| MCP Atlas (all) | not reported | 79.2% ↗ | — | — |
| MMAU | not reported | 77% ↗ | — | — |
| SWE-bench Pro (public) | not reported | 55.9% ↗ | — | — |
| Terminal-Bench 2.1 (best harness) | not reported | 64.7% ↗ | — | — |
| Toolathlon Verified | not reported | 54.4% ↗ | — | — |
| Toolathlon-Verified (HKUST) | not reported | 54.4% ↗ | — | — |
Scores tagged "epoch" or "matharena" are independent runs, used only where the lab has not published its own; ⚠ marks rows MathArena flags as released after the competition. Higher is better on every row. Δ is Claude Sonnet 5.5 minus Inkling-Small in the benchmark's own unit. "Not reported" means the lab has not published that figure; it is not a zero. ↗ opens the source.
Specs & pricing
Side by side
Official pricing pages and model cards| Spec | Claude Sonnet 5.5 | Inkling-Small | Edge |
|---|---|---|---|
| Context window | 1M tokens | 1M tokens | Tie |
| Max output | 128K tokens | — | — |
| Input price / 1M | $2 ↗ | $0.3 ↗ | Inkling-Small |
| Output price / 1M | $10 ↗ | $1.2 ↗ | Inkling-Small |
| Cached input / 1M | $0.2 ↗ | $0.06 ↗ | Inkling-Small |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $12 | $1.5 | Inkling-Small |
| Modalities | text · vision | text · vision · audio | Inkling-Small |
| Released | 2026-09-28 | 2026-07-30 | — |
| Cited benchmark scores | 29 | 29 | — |
Reliability
Provider status
Live from /statusMore matchups
Claude Sonnet 5.5 vs …
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Inkling-Small vs …
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Which one wins on your data?
Public benchmarks are a starting point. Run Claude Sonnet 5.5 and Inkling-Small on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.