Claude Haiku 4.5 vs Claude Mythos 5.1
At a Glance
| Compare | Claude Haiku 4.5Anthropic | Claude Mythos 5.1Anthropic |
|---|---|---|
| Intelligence, Cost, and Efficiency | ||
| IntelligenceHigher is better · MM Intelligence v2.5 | #43 of 469.0 score · 2/3 sources · provisional · missing LiveBench · full-core range 6.0–39.3 | UnrankedNot in the 46-model eligible cohort |
| Pricing and Limits | ||
| Input priceFrom · USD / 1M tokens | $1.00Anthropic ↗ · Sep 3, 2026 | $10.00Anthropic ↗ · Sep 2, 2026 |
| Output priceFrom · USD / 1M tokens | $5.00Anthropic ↗ · Sep 3, 2026 | $50.00Anthropic ↗ · Sep 2, 2026 |
| Context windowMaximum documented tokens | 200K | 1,000K |
| Model facts checked | Aug 28, 2026View model evidence → | Sep 2, 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
Side-by-Side Facts
| Field | Claude Haiku 4.5 | Claude Mythos 5.1 |
|---|---|---|
| Developer | Anthropic | Anthropic |
| Family | Claude 4 5 | Claude 5 1 |
| Model | Claude Haiku 4.5 | Claude Mythos 5.1 |
| Version | Claude Haiku 4.5 | Claude Mythos 5.1 |
| Lifecycle | active | active |
| Released | 2025-10-15 | 2026-09-01 |
| Knowledge cutoff | Unknown | 2026-06-01 |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
| Context window | 200K | 1,000K |
| 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) | Anthropic (Project Glasswing) |
| Capabilities | chat, generation, reasoning, tools | chat, generation, reasoning, tools |
Claude Haiku 4.5 Capabilities
Claude Mythos 5.1 Capabilities
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Primary Evidence
Sources and Freshness
Questions
Claude Haiku 4.5 vs Claude Mythos 5.1 FAQs
Is Claude Haiku 4.5 or Claude Mythos 5.1 better for coding?+
This comparison does not currently contain a protocol-matched coding benchmark for both Claude Haiku 4.5 and Claude Mythos 5.1, so Model Markets cannot name a coding leader from pricing, context size, or capability labels alone.
Which is cheaper, Claude Haiku 4.5 or Claude Mythos 5.1?+
Claude Haiku 4.5 is $1.00 and Claude Mythos 5.1 is $10.00 per million tokens, so Claude Haiku 4.5 is cheaper on this metric. Claude Haiku 4.5 is $5.00 and Claude Mythos 5.1 is $50.00 per million tokens, so Claude Haiku 4.5 is cheaper on this metric.
Which has a larger context window, Claude Haiku 4.5 or Claude Mythos 5.1?+
Claude Mythos 5.1 has the larger sourced context window. Claude Haiku 4.5 supports 200K and Claude Mythos 5.1 supports 1,000K.
Which performs better in benchmarks, Claude Haiku 4.5 or Claude Mythos 5.1?+
There is no overall benchmark winner: At least two independently verified, protocol-matched benchmarks are required for an overall winner.
Can Claude Haiku 4.5 or Claude Mythos 5.1 be self-hosted?+
Both models have the same recorded self-hosting status: unsupported. Claude Haiku 4.5 is not marked open weight; Claude Mythos 5.1 is not marked open weight.
Can Claude Haiku 4.5 and Claude Mythos 5.1 understand images?+
Claude Haiku 4.5 is documented with image input; Claude Mythos 5.1 is documented with image input. This reflects supported input modalities, not vision quality.
Which can generate longer answers, Claude Haiku 4.5 or Claude Mythos 5.1?+
Claude Mythos 5.1 has the larger sourced maximum output: Claude Haiku 4.5 supports 64K and Claude Mythos 5.1 supports 128K output tokens.
Do Claude Haiku 4.5 and Claude Mythos 5.1 support reasoning and tool use?+
Claude Haiku 4.5: reasoning, tool calling, and image input. Claude Mythos 5.1: reasoning, tool calling, and image input. Feature support does not establish relative quality.
Which is available from more inference providers, Claude Haiku 4.5 or Claude Mythos 5.1?+
Claude Haiku 4.5 has 2 sourced provider routes; Claude Mythos 5.1 has 1, so Claude Haiku 4.5 has broader tracked availability.
Which offers better value, Claude Haiku 4.5 or Claude Mythos 5.1?+
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.