Compare / head-to-head
Claude Opus 5.5vs
Inkling
Claude Opus 5.5 leads 19 of 20 shared benchmarks. Inkling is 4.8x 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
19 – 1
Claude Opus 5.5 leads
Cheaper per token
Inkling
4.8x cheaper, input + output
Larger context
Tie
both 1M tokens
Providers
2 providers
Anthropic · Thinking Machines Lab
Claude Opus 5.5
Anthropic · released 2026-09-22
textvision
Quality
Benchmark matrix
20 shared · 14 only Claude Opus 5.5 · 18 only Inkling| Benchmark | Claude Opus 5.5 | Inkling | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 20 | ||||
| GPQA Diamond | 90.6% ↗epoch run | 88.3% ↗epoch run | +2.3 pt | Claude Opus 5.5 |
| LMArena Elo | 1503.7 ↗ | 1441.4 ↗ | +62.3 | Claude Opus 5.5 |
| APEX-Agents (Mercor) | 73.5% ↗ | 33.8% ↗ | +39.7 pt | Claude Opus 5.5 |
| FrontierMath Tier 4 v2 (Epoch AI run) | 95% ↗epoch run | 4.9% ↗epoch run | +90.1 pt | Claude Opus 5.5 |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 91.2% ↗epoch run | 33.3% ↗epoch run | +57.9 pt | Claude Opus 5.5 |
| FrontierSWE V2 (Proximal Labs) | 62.3% ↗ | 4.1% ↗ | +58.2 pt | Claude Opus 5.5 |
| LiveBench Agentic Coding (LiveBench) | 71.7% ↗ | 49.4% ↗ | +22.3 pt | Claude Opus 5.5 |
| LiveBench Coding (LiveBench) | 89.3% ↗ | 71% ↗ | +18.3 pt | Claude Opus 5.5 |
| LiveBench Data Analysis (LiveBench) | 80.3% ↗ | 72.8% ↗ | +7.5 pt | Claude Opus 5.5 |
| LiveBench Instruction Following (LiveBench) | 67% ↗ | 70.1% ↗ | -3.1 pt | Inkling |
| LiveBench Language (LiveBench) | 86.3% ↗ | 73.5% ↗ | +12.8 pt | Claude Opus 5.5 |
| LiveBench Mathematics (LiveBench) | 97.1% ↗ | 88.4% ↗ | +8.7 pt | Claude Opus 5.5 |
| LiveBench Reasoning (LiveBench) | 92.2% ↗ | 78.3% ↗ | +13.9 pt | Claude Opus 5.5 |
| LMArena Agent (LMArena) | 0.1382 ↗ | -0.1086 ↗ | +0.2 | Claude Opus 5.5 |
| LMArena WebDev (LMArena) | 1815.4 ↗ | 1412.6 ↗ | +402.8 | Claude Opus 5.5 |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 100% ↗epoch run | 88.9% ↗epoch run | +11.1 pt | Claude Opus 5.5 |
| SAGE (Vals AI) | 45.8% ↗ | 36.6% ↗ | +9.2 pt | Claude Opus 5.5 |
| SimpleBench (SimpleBench) | 88.4% ↗ | 50% ↗ | +38.4 pt | Claude Opus 5.5 |
| SimpleQA Verified | 72.2% ↗epoch run | 43.9% ↗ | +28.3 pt | Claude Opus 5.5 |
| Terminal-Bench 4.0 (Vals AI) | 65.2% ↗ | 0.5% ↗ | +64.7 pt | Claude Opus 5.5 |
| Only Claude Opus 5.5 reports · 14 | ||||
| AutomationBench 1.0.6 | 40% ↗ | not reported | — | — |
| Chartography (with tools) | 89% ↗ | not reported | — | — |
| CursorBench 4.0 | 57.8% ↗ | not reported | — | — |
| EBR-bench (Epoch AI run) | 71.4% ↗epoch run | not reported | — | — |
| FrontierCode v1.1 (Main) | 54.4% ↗ | not reported | — | — |
| Furniture Assembly (Epoch AI run) | 83.3% ↗epoch run | not reported | — | — |
| GDPval-AA v2.1 | 1846 ↗ | not reported | — | — |
| Humanity's Last Exam (with tools) | 67.7% ↗ | not reported | — | — |
| MirrorCode (Epoch AI run) | 77.4% ↗epoch run | not reported | — | — |
| Mystery Game Puzzles (Epoch AI run) | 71% ↗epoch run | not reported | — | — |
| OSWorld 2.0 (partial) | 81.8% ↗ | not reported | — | — |
| Terminal-Bench 4.0 | 66.4% ↗ | not reported | — | — |
| Terminal-Bench Science 0.1 | 58.7% ↗ | not reported | — | — |
| Vending-Bench 2 (Andon Labs) | 9235.25 ↗ | not reported | — | — |
| Only Inkling reports · 18 | ||||
| SWE-bench Verified | not reported | 77.6% ↗ | — | — |
| AIME 2026 | not reported | 97.1% ↗ | — | — |
| Audio MC | not reported | 56.6% ↗ | — | — |
| BrowseComp (w/ ctx management) | not reported | 77.1% ↗ | — | — |
| CharXiv RQ | not reported | 78.1% ↗ | — | — |
| CharXiv RQ (with python) | not reported | 82% ↗ | — | — |
| Chess Puzzles (Epoch AI run) | not reported | 21% ↗epoch run | — | — |
| Global-MMLU-Lite | not reported | 88.7% ↗ | — | — |
| IFBench | not reported | 79.8% ↗ | — | — |
| MCP Atlas | not reported | 76% ↗ | — | — |
| MMAU | not reported | 77.2% ↗ | — | — |
| SWE-bench Pro (public) | not reported | 54.3% ↗ | — | — |
| tau2-bench Banking Knowledge (Sierra) | not reported | 25% ↗ | — | — |
| Terminal-Bench 2.1 (best harness) | not reported | 63.8% ↗ | — | — |
| Toolathlon Verified | not reported | 45.5% ↗ | — | — |
| Toolathlon-Verified (HKUST) | not reported | 45.5% ↗ | — | — |
| VoiceBench | not reported | 91.4% ↗ | — | — |
| WeirdML (Håvard Tveit Ihle) | not reported | 32.3% ↗ | — | — |
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 Opus 5.5 minus Inkling 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 Opus 5.5 | Inkling | Edge |
|---|---|---|---|
| Context window | 1M tokens | 1M tokens | Tie |
| Max output | 128K tokens | — | — |
| Input price / 1M | $4 ↗ | $1 ↗ | Inkling |
| Output price / 1M | $20 ↗ | $4.05 ↗ | Inkling |
| Cached input / 1M | $0.2 ↗ | $0.17 ↗ | Inkling |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $24 | $5.05 | Inkling |
| Modalities | text · vision | text · vision · audio | Inkling |
| Released | 2026-09-22 | 2026-07-15 | — |
| Cited benchmark scores | 34 | 39 | — |
Reliability
Provider status
Live from /statusMore matchups
Claude Opus 5.5 vs …
Models sharing the most benchmarksMore matchups
Inkling vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run Claude Opus 5.5 and Inkling on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.