Claude Opus 5 vs Gemini 2.5 Flash
At a Glance
| Compare | Claude Opus 5Anthropic |  Gemini 2.5 FlashGoogle DeepMind |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v2.5 | #3 of 4694.1 score · 3/3 sources · complete | UnrankedNot in the 46-model eligible cohort |
| CostLower is better · Published-token output estimate | #39 of 44$0.371 per LiveBench case | UnrankedNot in the 44-model eligible cohort |
| EfficiencyHigher is better · MM Efficiency v1.5 | #13 of 3857.6 score · 3/3 sources · complete | UnrankedNot in the 38-model eligible cohort |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $5.00Anthropic ↗ · Sep 3, 2026 | $0.30Google AI ↗ · Aug 29, 2026 |
| Output priceFrom · USD / 1M tokens | $25.00Anthropic ↗ · Sep 3, 2026 | $2.50Google AI ↗ · Aug 29, 2026 |
| Context windowMaximum documented tokens | 1,000K | 1,049K |
| Model facts checked | Aug 28, 2026View model evidence → | Aug 29, 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 5 | Gemini 2.5 Flash |
|---|---|---|
| LMArena Text Arenatext-2026-09-13-d25aabda0010 · arena_rating · leader | 1,504.92100% of row best · rating · claude-opus-5-high; 95% CI [1500.70174969, 1509.13092375]; votes 42617; rank 3 | 1,417.2794% of row best · rating · gemini-2.5-flash; 95% CI [1414.83704531, 1419.70406968]; votes 122732; rank 116 |
| LMArena Vision Arenavision-2026-09-13-d25aabda0010 · arena_rating · leader | 1,321.21100% of row best · rating · claude-opus-5-high; 95% CI [1313.68410123, 1328.73941303]; votes 11599; rank 3 | 1,235.9894% of row best · rating · gemini-2.5-flash; 95% CI [1231.30819372, 1240.64679816]; votes 58893; rank 64 |
| ToneBench2026-09-11-10-task-4ef099199c9c · overall_score · unverified | 88.76100% of row best · points · Claude Opus 5 (max effort) · 9,446 output tokens / case | 72.1781% of row best · points · Gemini 2.5 Flash · 4,399 output tokens / case |
| 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 5 | Gemini 2.5 Flash |
|---|---|---|
| Developer | Anthropic | Google DeepMind |
| Family | Claude 5 | Gemini 2 5 |
| Model | Claude Opus 5 | Gemini 2.5 Flash |
| Version | Claude Opus 5 | Gemini 2.5 Flash |
| Lifecycle | active | active |
| Released | 2026-07-24 | Unknown |
| Knowledge cutoff | Unknown | 2025-01-01 |
| Input modalities | Text, Image | Text, Image, Video, Audio |
| Output modalities | Text | Text |
| Context window | 1,000K | 1,049K |
| 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), Deepinfra (Standard), Openrouter (Standard) | Google AI (Standard), Google Gemini (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, generation, reasoning, tools |
Claude Opus 5 Capabilities
Gemini 2.5 Flash Capabilities
Related Comparisons
All text comparisons →| A | Pair | B | Context |
|---|---|---|---|
Claude Opus 4.8Anthropic | vs | Claude Opus 5Anthropic | family variantsimage, text |
Claude Opus 5Anthropic | vs |  GPT-6 AstraOpenAI | cross-developer peersimage, text |
Claude Fable 5.1Anthropic | vs | Claude Opus 5Anthropic | family variantsimage, text |
Claude Opus 5Anthropic | vs | Gemini 3.1 ProGoogle DeepMind | cross-developer peerstext |
Claude Opus 5Anthropic | vs |  DeepSeek-V4.1-FlashDeepSeek | cross-developer peersimage, text |
Claude Opus 5Anthropic | vs | Grok 4.6xAI | cross-developer peersimage, text |
Claude Opus 5Anthropic | vs |  Qwen3.8-MaxQwen | cross-developer peersimage, text |
Claude Opus 5Anthropic | vs |  Kimi-K3Moonshot AI | cross-developer peersimage, text |
 MiniMax-M3MiniMax | vs | Claude Opus 5Anthropic | cross-developer peersimage, text |
Claude Opus 5Anthropic | vs |  GLM-5.3Z.ai | cross-developer peerstext |
Claude Opus 5Anthropic | vs |  Hy4 previewTencent | cross-developer peerstext |
Claude Opus 5Anthropic | vs | Seed 2.1 ProByteDance Seed | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
Claude Opus 5 vs Gemini 2.5 Flash FAQs
Is Claude Opus 5 or Gemini 2.5 Flash better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Opus 5 and Gemini 2.5 Flash, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Opus 5 or Gemini 2.5 Flash?+
Claude Opus 5 is $5.00 and Gemini 2.5 Flash is $0.30 per million tokens, so Gemini 2.5 Flash is cheaper on this metric. Claude Opus 5 is $25.00 and Gemini 2.5 Flash is $2.50 per million tokens, so Gemini 2.5 Flash is cheaper on this metric.
Which has a larger context window, Claude Opus 5 or Gemini 2.5 Flash?+
Gemini 2.5 Flash has the larger sourced context window. Claude Opus 5 supports 1,000K and Gemini 2.5 Flash supports 1,049K.
Which performs better in benchmarks, Claude Opus 5 or Gemini 2.5 Flash?+
There is no overall benchmark winner: An overall winner requires at least two decisive benchmarks from at least two original publishers.
Can Claude Opus 5 or Gemini 2.5 Flash be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Opus 5 is not marked open weight; Gemini 2.5 Flash is not marked open weight.
Can Claude Opus 5 and Gemini 2.5 Flash understand images?+
Claude Opus 5 is documented with image input; Gemini 2.5 Flash is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Opus 5 or Gemini 2.5 Flash?+
Claude Opus 5 has the larger sourced maximum output: Claude Opus 5 supports 128K and Gemini 2.5 Flash supports 66K output tokens.
Do Claude Opus 5 and Gemini 2.5 Flash support reasoning and tool use?+
Claude Opus 5: reasoning, tool calling, and image input. Gemini 2.5 Flash: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Opus 5 or Gemini 2.5 Flash?+
Claude Opus 5 has 3 sourced provider routes; Gemini 2.5 Flash has 2, so Claude Opus 5 has broader tracked availability.
Which offers better value, Claude Opus 5 or Gemini 2.5 Flash?+
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.