Claude Opus 4.5 vs GPT-5
Benchmark Performance
Available Benchmarks
| Benchmark | Claude Opus 4.5 | GPT-5 |
|---|---|---|
| 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 | 1,132.7796% of row best · rating · gpt-5-search; 95% CI [1126.91788409, 1138.61733849]; votes 20781; rank 30 |
| 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 | 1,405.9697% of row best · rating · gpt-5-high; 95% CI [1401.51371519, 1410.40173213]; votes 31418; rank 132 |
| Overall ResultCounted from the protocol-matched rows above | 2 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 | GPT-5 |
|---|---|---|
| Developer | Anthropic | Openai |
| Family | Claude 4 | Gpt 5 |
| Model | Claude Opus 4.5 | GPT-5 |
| Version | Claude Opus 4.5 | GPT-5 |
| Lifecycle | active | active |
| Released | 2025-11-24 | 2025-08-07 |
| Knowledge cutoff | 2025-05-01 | 2024-09-30 |
| Input modalities | Unknown | Unknown |
| Output modalities | Unknown | Unknown |
| Context window | 200,000 | 400,000 |
| 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) | Openai (Standard), Openrouter (Standard) |
| Capabilities | chat, generation, reasoning, structured_outputs, tools | chat, generation, reasoning, structured_outputs, tools |
13 comparable fields · 8 material differences · Interactive comparison only; indexing gate not met
Claude Opus 4.5 Capabilities
GPT-5 Capabilities
Internal Comparison Graph
Related Comparisons
| A | Pair | B | Context |
|---|---|---|---|
GPT-5OpenAI | vs | GPT-5.1OpenAI | family variantsimage, text |
Claude Opus 4.5Anthropic | vs | Claude Opus 4.6Anthropic | family variantsimage, text |
GPT-5OpenAI | vs | GPT-5 MiniOpenAI | family variantsimage, text |
Claude Opus 4.5Anthropic | vs | Claude Opus 4.7Anthropic | family variantsimage, text |
Claude Opus 4.5Anthropic | vs | Claude Sonnet 4.5Anthropic | family variantsimage, text |
Claude Opus 4.5Anthropic | vs | o3OpenAI | cross-developer peersimage, text |
Claude Opus 4.5Anthropic | vs | o3-proOpenAI | cross-developer peersimage, text |
GPT-5OpenAI | vs | Grok 4.5xAI | cross-developer peersimage, text |
Claude Opus 4.5Anthropic | vs |  Gemma 4 12BGoogle DeepMind | cross-developer peersimage, text |
Claude Opus 4.5Anthropic | vs | GPT-5.4 MiniOpenAI | cross-developer peersimage, text |
Claude Opus 4.5Anthropic | vs | GPT-5.4 NanoOpenAI | cross-developer peersimage, text |
GPT-4oOpenAI | vs | GPT-5OpenAI | family variantsimage, text |
Primary Evidence
Sources and Freshness
Questions
Claude Opus 4.5 vs GPT-5 FAQs
Is Claude Opus 4.5 or GPT-5 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Opus 4.5 and GPT-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 GPT-5?+
Only GPT-5 has a directly sourced input price: $0.625 per million tokens. Only GPT-5 has a directly sourced output price: $5.00 per million tokens.
Which has a larger context window, Claude Opus 4.5 or GPT-5?+
GPT-5 has the larger sourced context window. Claude Opus 4.5 supports 200,000 and GPT-5 supports 400,000.
Which performs better in benchmarks, Claude Opus 4.5 or GPT-5?+
There is no overall benchmark winner: An overall winner requires at least two decisive benchmarks from at least two original publishers.
Can Claude Opus 4.5 or GPT-5 be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Opus 4.5 is not marked open weight; GPT-5 is not marked open weight.
Can Claude Opus 4.5 and GPT-5 understand images?+
Claude Opus 4.5 is not documented with image input; GPT-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 GPT-5?+
GPT-5 has the larger sourced maximum output: Claude Opus 4.5 supports 64,000 and GPT-5 supports 128,000 output tokens.
Do Claude Opus 4.5 and GPT-5 support reasoning and tool use?+
Claude Opus 4.5: reasoning and tool calling. GPT-5: reasoning and tool calling. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Opus 4.5 or GPT-5?+
Claude Opus 4.5 has 1 sourced provider route; GPT-5 has 2, so GPT-5 has broader tracked availability.
Which offers better value, Claude Opus 4.5 or GPT-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.