Model comparison
Claude 1.3 vs Claude Opus 5.5
Claude Opus 5.5 has enough public results to be ranked (#3); Claude 1.3 does not yet, so treat this comparison as directional.
Last verified . 0 shared benchmarks.
Side by side
| Claude 1.3 | Claude Opus 5.5 | |
|---|---|---|
| Provider | Anthropic | Anthropic |
| Noometry Index | — | 68.6 |
| Released | 2023-04-18 | 2026-09-22 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1M |
| Max output | — | 128K |
| Input $ / M tokens | — | $4 |
| Output $ / M tokens | — | $20 |
| Results tracked | 2 | 44 |
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Category by category
Coding Not comparable
Claude 1.3: —, Claude Opus 5.5: 71.9 (#3)
| Benchmark | Claude 1.3 | Claude Opus 5.5 |
|---|---|---|
| FrontierCode | — | 54.6% |
| CursorBench | — | 57.8% |
| LMArena WebDev | — | 1813 |
| FrontierSWE | — | 62.3% |
| SciCode | — | 66.9% |
| LMArena Coding | — | 1547 |
| MirrorCode | — | 77.4% |
| ALE-Bench | — | 2,147 |
Agentic & Tool Use Not comparable
Claude 1.3: —, Claude Opus 5.5: 45.3 (#15)
| Benchmark | Claude 1.3 | Claude Opus 5.5 |
|---|---|---|
| APEX-Agents | — | 73.5% |
| GDP.pdf | — | 30.6% |
| Vending-Bench 2 | — | 9,235 |
Reasoning Not comparable
Claude 1.3: —, Claude Opus 5.5: 80.2 (#3)
| Benchmark | Claude 1.3 | Claude Opus 5.5 |
|---|---|---|
| ARC-AGI-2 | — | 93.3% |
| NYT Connections (extended) | — | 88.5% |
| ARC-AGI-1 | — | 98.5% |
| CritPt | — | 31.7% |
| EBR-Bench | — | 71.4% |
| LMArena Hard Prompts | — | 1535 |
| Mystery Game Puzzles | — | 71% |
| DTBench | — | 98.9% |
| LMCA | — | 68.2% |
| Epoch Capabilities Index | — | 167.33 |
Math Not comparable
Claude 1.3: —, Claude Opus 5.5: 91.8 (#3)
| Benchmark | Claude 1.3 | Claude Opus 5.5 |
|---|---|---|
| FrontierMath (Tiers 1-3) | — | 91.2% |
| FrontierMath Tier 4 | — | 95% |
| OTIS Mock AIME 2024-2025 | — | 100% |
| ProofBench | — | 100% |
| LMArena Math | — | 1506 |
| FrontierMath Erdős | — | 2.9% |
Knowledge Not comparable
Claude 1.3: —, Claude Opus 5.5: 66.4 (#10)
| Benchmark | Claude 1.3 | Claude Opus 5.5 |
|---|---|---|
| GPQA Diamond | — | 90.6% |
| SimpleQA Verified | — | 72.2% |
| LMArena Expert | — | 1547 |
| MMLU | 77% | — |
| TriviaQA | 86.7% | — |
Multimodal Not comparable
Claude 1.3: —, Claude Opus 5.5: 57.8 (#1)
| Benchmark | Claude 1.3 | Claude Opus 5.5 |
|---|---|---|
| LMArena Vision | — | 1321 |
| Blueprint-Bench 2 | — | 51.2% |
| Furniture Assembly | — | 83.3% |
Multilingual Not comparable
Claude 1.3: —, Claude Opus 5.5: 59.1 (#2)
| Benchmark | Claude 1.3 | Claude Opus 5.5 |
|---|---|---|
| LMArena Non-English | — | 1507 |
| LMArena Chinese | — | 1588 |
| LMArena French | — | 1514 |
| LMArena Russian | — | 1520 |
| LMArena Spanish | — | 1507 |
Instruction Following Not comparable
Claude 1.3: —, Claude Opus 5.5: 80.0 (#3)
| Benchmark | Claude 1.3 | Claude Opus 5.5 |
|---|---|---|
| LMArena Instruction Following | — | 1537 |
Long Context Not comparable
Claude 1.3: —, Claude Opus 5.5: 47.1 (#19)
| Benchmark | Claude 1.3 | Claude Opus 5.5 |
|---|---|---|
| LMArena Longer Query | — | 1532 |
Writing & Preference Not comparable
Claude 1.3: —, Claude Opus 5.5: 78.2 (#3)
| Benchmark | Claude 1.3 | Claude Opus 5.5 |
|---|---|---|
| LMArena Text | — | 1515 |
| LMArena Creative Writing | — | 1533 |
| EQ-Bench Creative Writing | — | 2050 |
| LMArena Multi-Turn | — | 1499 |
Frequently asked questions
Is Claude 1.3 better than Claude Opus 5.5?
Claude Opus 5.5 has enough public results to be ranked (#3); Claude 1.3 does not yet, so treat this comparison as directional.
How many benchmarks do Claude 1.3 and Claude Opus 5.5 share?
0 benchmarks have published results for both models. Claude 1.3 has 2 scored results on Noometry and Claude Opus 5.5 has 44.