Claude Opus 4.5 vs GPT-5
At a Glance
| Compare | Claude Opus 4.5Anthropic |  GPT-5OpenAI |
|---|---|---|
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $5.00Anthropic ↗ · Sep 3, 2026 | $0.625Openrouter ↗ · Sep 3, 2026 |
| Output priceFrom · USD / 1M tokens | $25.00Anthropic ↗ · Sep 3, 2026 | $5.00Openrouter ↗ · Sep 3, 2026 |
| Context windowMaximum documented tokens | 200K | 400K |
| 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 | GPT-5 |
|---|---|---|
| LMArena Search Arenasearch-2026-10-13-a64ca3b12b6e · 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 | 1,133.4996% of row best · rating · gpt-5-search; 95% CI [1127.51131313, 1139.47049228]; votes 20865; rank 38 |
| LMArena Text Arenatext-2026-10-15-a64ca3b12b6e · 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 | 1,406.1897% of row best · rating · gpt-5-high; 95% CI [1401.76102728, 1410.60028213]; votes 31722; rank 146 |
| Overall ResultCounted from the protocol-matched rows above | 2 benchmark winsNo overall winner | 0 benchmark winsNo overall winner |
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 | 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 | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 200K | 400K |
| 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 |
Claude Opus 4.5 Capabilities
GPT-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 | Claude Sonnet 4.5Anthropic | 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-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 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?+
Claude Opus 4.5 is $5.00 and GPT-5 is $0.625 per million tokens, so GPT-5 is cheaper on this metric. Claude Opus 4.5 is $25.00 and GPT-5 is $5.00 per million tokens, so GPT-5 is cheaper on this metric.
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 tokens and GPT-5 supports 400,000 tokens.
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 sourced 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 documented with image input; GPT-5 is 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 tokens and GPT-5 supports 128,000 tokens.
Do Claude Opus 4.5 and GPT-5 support reasoning and tool use?+
Claude Opus 4.5: reasoning, tool calling, and image input. GPT-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 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.