Claude Opus 4.5 vs Claude Sonnet 4.5
At a Glance
| Compare | Claude Opus 4.5Anthropic | Claude Sonnet 4.5Anthropic |
|---|---|---|
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $5.00Anthropic ↗ · Sep 3, 2026 | $3.00Anthropic ↗ · Sep 3, 2026 |
| Output priceFrom · USD / 1M tokens | $25.00Anthropic ↗ · Sep 3, 2026 | $15.00Anthropic ↗ · Sep 3, 2026 |
| Context windowMaximum documented tokens | 200K | 200K |
| Model facts checked | Sep 3, 2026View model evidence → | Sep 3, 2026View model evidence → |
Token prices are the lowest available sourced USD rates; input and output may use different providers. Cost ranking estimates output spend on LiveBench, not a full request bill. Ranking methodology →
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-2026-09-13-0ebb411abf00 · arena_rating · statistical tie | 1,462.20100% of row best · rating · claude-opus-4-5-20251101; 95% CI [1451.78988580, 1472.60655272]; votes 7981; rank 21 | 1,449.8199% of row best · rating · claude-sonnet-4-5-20250929; 95% CI [1443.68972646, 1455.92640287]; votes 31455; rank 28 |
| LMArena Search Arenasearch-2026-10-13-0ebb411abf00 · arena_rating · leader | 1,179.58100% of row best · rating · claude-opus-4-5-search; 95% CI [1173.98777416, 1185.18060388]; votes 65047; rank 25 | 1,160.2798% of row best · rating · claude-sonnet-4-5-search; 95% CI [1155.14751166, 1165.38826265]; votes 144153; rank 31 |
| LMArena Text Arenatext-2026-10-15-0ebb411abf00 · arena_rating · leader | 1,448.19100% of row best · rating · claude-opus-4-5-20251101-high-32k; 95% CI [1444.36613918, 1452.02144591]; votes 37509; rank 54 | 1,434.5899% of row best · rating · claude-sonnet-4-5-20250929-high-32k; 95% CI [1431.82164426, 1437.34230911]; votes 83940; rank 88 |
| 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.
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 | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 200K | 200K |
| 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 |
Claude Opus 4.5 Capabilities
Claude Sonnet 4.5 Capabilities
Related Comparisons
All image comparisons →| A | Pair | B | Context |
|---|---|---|---|
Claude Opus 4.5Anthropic | vs | cross-developer peersimage, text | |
Claude Haiku 4.5Anthropic | vs | Claude Opus 4.5Anthropic | family variantsimage, text |
Claude Opus 4.5Anthropic | vs | Claude Opus 4.6Anthropic | family variantsimage, text |
Claude Opus 4.5Anthropic | vs | Claude Opus 4.7Anthropic | family variantsimage, text |
Claude Opus 4.5Anthropic | vs | Seed 1.8ByteDance Seed | cross-developer peersimage, text |
Claude Opus 4.5Anthropic | vs |  Gemma 4 12BGoogle DeepMind | cross-developer peersimage, text |
Claude Opus 4.5Anthropic | vs |  GPT-5OpenAI | cross-developer peersimage, text |
Claude Opus 4.5Anthropic | vs | GPT-5.3-CodexOpenAI | cross-developer peersimage, text |
Claude Opus 4.5Anthropic | vs | GPT-5.4 NanoOpenAI | cross-developer peersimage, text |
Claude Opus 4.5Anthropic | vs | o3OpenAI | cross-developer peersimage, text |
Claude Opus 4.5Anthropic | vs | o3-proOpenAI | cross-developer peersimage, text |
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?+
Claude Opus 4.5 is $5.00 and Claude Sonnet 4.5 is $3.00 per million tokens, so Claude Sonnet 4.5 is cheaper on this metric. Claude Opus 4.5 is $25.00 and Claude Sonnet 4.5 is $15.00 per million tokens, so Claude Sonnet 4.5 is cheaper on this metric.
Which has a larger context window, Claude Opus 4.5 or Claude Sonnet 4.5?+
Both models have the same sourced context window: 200,000 tokens each.
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 sourced 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 documented with image input; Claude Sonnet 4.5 is 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?+
Both models have the same sourced maximum output: 64,000 tokens each.
Do Claude Opus 4.5 and Claude Sonnet 4.5 support reasoning and tool use?+
Claude Opus 4.5: reasoning, tool calling, and image input. Claude Sonnet 4.5: reasoning, tool calling, and image input. 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.