Claude Fable 5 vs Claude Opus 4.8
Benchmark Performance
Available Benchmarks
| Benchmark | Claude Fable 5 | Claude Opus 4.8 |
|---|---|---|
| LMArena Document Arenadocument-2026-07-30-011508720696 · arena_rating · leader | 1,504.25100% of row best · rating · claude-fable-5; 95% CI [1495.07964874, 1513.41865883]; votes 5792; rank 4 | 1,468.9098% of row best · rating · claude-opus-4-8; 95% CI [1460.58009276, 1477.22476172]; votes 8193; rank 16 |
| LMArena Search Arenasearch-2026-08-24-011508720696 · arena_rating · leader | 1,230.22100% of row best · rating · claude-fable-5; 95% CI [1222.30895335, 1238.13609545]; votes 41795; rank 5 | 1,204.3098% of row best · rating · claude-opus-4-8; 95% CI [1197.89112684, 1210.71069451]; votes 70998; rank 12 |
| LMArena Text Arenatext-2026-09-01-011508720696 · arena_rating · leader | 1,494.40100% of row best · rating · claude-fable-5; 95% CI [1489.42750707, 1499.38052801]; votes 26977; rank 5 | 1,451.9897% of row best · rating · claude-opus-4-8; 95% CI [1447.69484580, 1456.25837678]; votes 49123; rank 38 |
| LMArena Vision Arenavision-2026-08-27-011508720696 · arena_rating · leader | 1,329.46100% of row best · rating · claude-fable-5; 95% CI [1321.03632319, 1337.88661881]; votes 10002; rank 1 | 1,288.8197% of row best · rating · claude-opus-4-8; 95% CI [1281.38044914, 1296.24567110]; votes 13980; rank 23 |
| LiveBench2026-06-25 · overall · leader | 86.55100% of row best · percent · claude-fable-5-max-effort · 20,255 output tokens / case | 81.1894% of row best · percent · claude-opus-4-8-max-effort · 24,171 output tokens / case |
| ToneBench2026-08-14-10-task · overall_score · leader | 90.35100% of row best · points · Claude Fable 5 (max effort + 4.8 fallback) · 14,132 output tokens / case | 88.0997% of row best · points · Claude Opus 4.8 (max effort) · 13,476 output tokens / case |
| Overall ResultCounted from the protocol-matched rows above | 6 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 Fable 5 | Claude Opus 4.8 |
|---|---|---|
| Developer | Anthropic | Anthropic |
| Family | Claude 5 | Claude 4 8 |
| Model | Claude Fable 5 | Claude Opus 4.8 |
| Version | Claude Fable 5 | Claude Opus 4.8 |
| Lifecycle | active | active |
| Released | 2026-06-09 | 2026-05-28 |
| Knowledge cutoff | Unknown | 2026-01-01 |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 1,000,000 | 1,000,000 |
| 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), Deepinfra (Standard), Openrouter (Standard) | Anthropic (Standard), Deepinfra (Standard) |
| Capabilities | chat, generation, reasoning, tools | chat, generation, reasoning, tools |
14 comparable fields · 5 material differences · Pair passes the primary-source comparison gate
Claude Fable 5 Capabilities
Claude Opus 4.8 Capabilities
Internal Comparison Graph
Related Comparisons
| A | Pair | B | Context |
|---|---|---|---|
Claude Fable 5Anthropic | vs | Claude Fable 5.1Anthropic | family variantsimage, text |
Claude Fable 5Anthropic | vs | Claude Mythos 5.1Anthropic | family variantsimage, text |
Claude Opus 4.8Anthropic | vs | Claude Opus 5Anthropic | family variantsimage, text |
Claude Mythos 5.1Anthropic | vs | Claude Opus 4.8Anthropic | family variantsimage, text |
Claude Opus 4.8Anthropic | vs | Claude Sonnet 5Anthropic | family variantsimage, text |
Claude Fable 5Anthropic | vs | Claude Haiku 4.5Anthropic | family variantsimage, text |
 MiniMax-M3MiniMax | vs | Claude Fable 5Anthropic | cross-developer peersimage, text |
MiniMax-M3MiniMax | vs | Claude Opus 4.8Anthropic | cross-developer peersimage, text |
Claude Fable 5Anthropic | vs |  GPT-5.6 LunaOpenAI | cross-developer peersimage, text |
Claude Fable 5Anthropic | vs | GPT-5.6 SolOpenAI | cross-developer peersimage, text |
Claude Fable 5Anthropic | vs | GPT-5.6 TerraOpenAI | cross-developer peersimage, text |
Claude Opus 4.8Anthropic | vs | GPT-5.6 LunaOpenAI | cross-developer peersimage, text |
Primary Evidence
Sources and Freshness
Questions
Claude Fable 5 vs Claude Opus 4.8 FAQs
Is Claude Fable 5 or Claude Opus 4.8 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Fable 5 and Claude Opus 4.8, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Fable 5 or Claude Opus 4.8?+
Claude Fable 5 is $10.00 and Claude Opus 4.8 is $5.00 per million tokens, so Claude Opus 4.8 is cheaper on this metric. Claude Fable 5 is $50.00 and Claude Opus 4.8 is $25.00 per million tokens, so Claude Opus 4.8 is cheaper on this metric.
Which has a larger context window, Claude Fable 5 or Claude Opus 4.8?+
Neither model has a larger sourced context window in this comparison. Claude Fable 5 is 1,000,000 and Claude Opus 4.8 is 1,000,000.
Which performs better in benchmarks, Claude Fable 5 or Claude Opus 4.8?+
Claude Fable 5 leads the current overall benchmark count. The result uses 6 protocol-matched benchmarks from 3 publishers; it is not a universal quality score.
Can Claude Fable 5 or Claude Opus 4.8 be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Fable 5 is not marked open weight; Claude Opus 4.8 is not marked open weight.
Can Claude Fable 5 and Claude Opus 4.8 understand images?+
Claude Fable 5 is documented with image input; Claude Opus 4.8 is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Fable 5 or Claude Opus 4.8?+
Neither has a larger sourced maximum output. Claude Fable 5 is 128,000 and Claude Opus 4.8 is 128,000.
Do Claude Fable 5 and Claude Opus 4.8 support reasoning and tool use?+
Claude Fable 5: reasoning, tool calling, and image input. Claude Opus 4.8: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Fable 5 or Claude Opus 4.8?+
Claude Fable 5 has 3 sourced provider routes; Claude Opus 4.8 has 2, so Claude Fable 5 has broader tracked availability.
Which offers better value, Claude Fable 5 or Claude Opus 4.8?+
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.