Claude Opus 4.5 vs Claude Sonnet 4.5
Benchmark Performance
Available Benchmarks
| Benchmark | Claude Opus 4.5 | Claude Sonnet 4.5 |
|---|---|---|
| Berkeley Function Calling Leaderboardv4-ede5081a24bc · overall_accuracy · leader | 33.47100% of row best · percent · Claude-Opus-4-5-20251101 (Prompt) | 24.9074% of row best · percent · Claude-Sonnet-4-5-20250929 (Prompt) |
| LMArena Document Arenadocument-2026-07-30-011508720696 · arena_rating · statistical tie | 1,461.65100% of row best · rating · claude-opus-4-5-20251101; 95% CI [1451.22442739, 1472.08183979]; votes 7965; rank 19 | 1,446.1999% of row best · rating · claude-sonnet-4-5-20250929; 95% CI [1439.60004073, 1452.78970477]; votes 28634; rank 22 |
| LMArena Search Arenasearch-2026-08-24-011508720696 · arena_rating · leader | 1,179.64100% of row best · rating · claude-opus-4-5-search; 95% CI [1174.02872051, 1185.26030035]; votes 61573; rank 19 | 1,158.4698% of row best · rating · claude-sonnet-4-5-search; 95% CI [1153.41447529, 1163.49714967]; votes 127378; rank 24 |
| LMArena Text Arenatext-2026-09-01-011508720696 · arena_rating · leader | 1,447.19100% of row best · rating · claude-opus-4-5-20251101-high-32k; 95% CI [1443.28922560, 1451.09589305]; votes 36271; rank 46 | 1,433.9599% of row best · rating · claude-sonnet-4-5-20250929-high-32k; 95% CI [1431.13754052, 1436.75329939]; votes 81031; rank 79 |
| Overall ResultCounted from the protocol-matched rows above · 1 tie | 3 benchmark winsOverall lead | 0 benchmark wins |
Third-party benchmark Only like-for-like primary-publisher results are shown; raw scores, relative scores, configuration, and token spend remain visible.
Technical Differences
Side-by-Side Facts
| Field | Claude Opus 4.5 | Claude Sonnet 4.5 |
|---|---|---|
| Developer | Anthropic | Anthropic |
| Family | Claude 4 | Claude 4 |
| Model | Claude Opus 4.5 | Claude Sonnet 4.5 |
| Version | Claude Opus 4.5 | Claude Sonnet 4.5 |
| Lifecycle | active | active |
| Released | 2025-11-24 | 2025-09-29 |
| Knowledge cutoff | 2025-05-01 | 2025-01-01 |
| Input modalities | Unknown | Unknown |
| Output modalities | Unknown | Unknown |
| Context window | 200,000 | 200,000 |
| Total parameters | Unknown | Unknown |
| Active parameters | Unknown | Unknown |
| License | Unknown | Unknown |
| Open weights | No | No |
| API available | Yes | Yes |
| Self-hostable | No | No |
| Provider access | Anthropic (Standard) | Anthropic (Standard) |
| Capabilities | chat, generation, reasoning, structured_outputs, tools | chat, generation, reasoning, structured_outputs, tools |
13 comparable fields · 4 material differences · Interactive comparison only; indexing gate not met
Claude Opus 4.5 Capabilities
Claude Sonnet 4.5 Capabilities
Primary Evidence
Sources and Freshness
Questions
Claude Opus 4.5 vs Claude Sonnet 4.5 FAQs
Is Claude Opus 4.5 or Claude Sonnet 4.5 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Opus 4.5 and Claude Sonnet 4.5, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Opus 4.5 or Claude Sonnet 4.5?+
Neither model has a directly sourced input price in this comparison. Neither model has a directly sourced output price in this comparison.
Which has a larger context window, Claude Opus 4.5 or Claude Sonnet 4.5?+
Neither model has a larger sourced context window in this comparison. Claude Opus 4.5 is 200,000 and Claude Sonnet 4.5 is 200,000.
Which performs better in benchmarks, Claude Opus 4.5 or Claude Sonnet 4.5?+
Claude Opus 4.5 leads the current overall benchmark count. The result uses 4 protocol-matched benchmarks from 2 publishers; it is not a universal quality score.
Can Claude Opus 4.5 or Claude Sonnet 4.5 be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Opus 4.5 is not marked open weight; Claude Sonnet 4.5 is not marked open weight.
Can Claude Opus 4.5 and Claude Sonnet 4.5 understand images?+
Claude Opus 4.5 is not documented with image input; Claude Sonnet 4.5 is not documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Opus 4.5 or Claude Sonnet 4.5?+
Neither has a larger sourced maximum output. Claude Opus 4.5 is 64,000 and Claude Sonnet 4.5 is 64,000.
Do Claude Opus 4.5 and Claude Sonnet 4.5 support reasoning and tool use?+
Claude Opus 4.5: reasoning and tool calling. Claude Sonnet 4.5: reasoning and tool calling. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Opus 4.5 or Claude Sonnet 4.5?+
Claude Opus 4.5 has 1 sourced provider route; Claude Sonnet 4.5 has 1, a tie.
Which offers better value, Claude Opus 4.5 or Claude Sonnet 4.5?+
There is no universal value winner. Compare the input and output prices above with the matched benchmark result for your workload: cheaper tokens can be offset by different quality, token usage, latency, or provider availability.