Model comparison
Claude Fable 5 vs Claude Haiku 4.5
Head-to-head evidence from 2 shared benchmark results across 2 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: Claude Fable 5 #2 (Supported); Claude Haiku 4.5 #77 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. Claude Fable 5 and Claude Haiku 4.5 share 2 comparable benchmark results. 1 of 8 categories are comparable. 32 results are unique to Claude Fable 5; 3 to Claude Haiku 4.5.
Updated July 23, 2026- Shared results
- 2
- Claude Fable 5 only
- 32
- Claude Haiku 4.5 only
- 3
- Comparable categories
- 1 / 8
Pick Claude Fable 5 if you want the stronger benchmark profile. Claude Haiku 4.5 only becomes the better choice if you want the cheaper token bill or you would rather avoid the extra latency and token burn of a reasoning model.
Confidence note. This is a partial-evidence comparison with 2 shared benchmark results across 2 evidence categories; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
Claude Fable 5 is clearly ahead on the BenchAlign aggregate, 83.68 to 56.58. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Claude Fable 5's sharpest advantage is in coding, where it averages 89.2 against 73.3. The single biggest benchmark swing on the page is SWE-bench Verified, 95% to 73.3%.
Claude Fable 5 is also the more expensive model on tokens at $10.00 input / $50.00 output per 1M tokens, versus $1.00 input / $5.00 output per 1M tokens for Claude Haiku 4.5. That is roughly 10.0x on output cost alone. Claude Fable 5 is the reasoning model in the pair, while Claude Haiku 4.5 is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. Claude Fable 5 gives you the larger context window at 1M+, compared with 200K for Claude Haiku 4.5.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | Claude Fable 5 | Δ | Claude Haiku 4.5 |
|---|---|---|---|
| Coding | Claude Fable 589.2 | Margin← 15.9 | Claude Haiku 4.573.3 |
| Agentic | Claude Fable 584.6 | MarginNo overlap | Claude Haiku 4.5Not measured |
| Math | Claude Fable 5Not measured | MarginNo overlap | Claude Haiku 4.54.9 |
| Multimodal | Claude Fable 557.9 | MarginNo overlap | Claude Haiku 4.5Not measured |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
SWE-bench Verified
CodingA 95%B 73.3%Winner: Claude Fable 5Δ 21.7SWE-bench Verified: Claude Fable 5 scored 95%; Claude Haiku 4.5 scored 73.3%. Claude Fable 5 wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | Claude Fable 5 | Claude Haiku 4.5 | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | Claude Fable 5$10 input / $50 output | Claude Haiku 4.5$1 input / $5 output | Claude Haiku 4.5 has the lower combined listed price. |
| Generation speedtokens per second | Claude Fable 5Not available | Claude Haiku 4.5Not available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | Claude Fable 5Not available | Claude Haiku 4.5Not available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | Claude Fable 51M+ | Claude Haiku 4.5200K | Claude Fable 5 lists the larger context window. |
Benchmark Deep Dive
Agentic14 benchmarks
| Benchmark | Claude Fable 5 | Claude Haiku 4.5 | Result |
|---|---|---|---|
| Terminal-Bench 2.0Source | 84.3% | — | Not comparable |
| OSWorld-VerifiedSource | 85% | — | Not comparable |
| GDPval-AASource | 1748 | — | Not comparable |
| AA Agentic IndexSource | 52.8% | — | Not comparable |
| τ²-bench resultsSource | 98.5% | — | Not comparable |
| GDPval-AASource | 62.4% | — | Not comparable |
| AA BriefcaseSource | 1574 | — | Not comparable |
| AA AutomationBenchSource | 48.6% | — | Not comparable |
| AA EnterpriseOps-GymSource | 51.1% | — | Not comparable |
| AA Harvey LABSource | 93.6% | — | Not comparable |
| AA Tau3 BankingSource | 26.8% | — | Not comparable |
| terminalBenchHardSource | 62.9% | — | Not comparable |
| aaTerminalBench21Source | 84.6% | — | Not comparable |
| JobBenchSource | — | 16.0% | Not comparable |
CodingClaude Fable 5 wins9 benchmarks
| Benchmark | Claude Fable 5 | Claude Haiku 4.5 | Result |
|---|---|---|---|
| SWE-bench VerifiedSource | 95% | 73.3% | Claude Fable 5 leads |
| SWE-bench ProSource | 80% | — | Not comparable |
| FrontierCode 1.1 MainSource | 53.5% | — | Not comparable |
| Terminal-Bench 2.0Source | 84.3% | — | Not comparable |
| cursorBench31Source | 70.6% | — | Not comparable |
| cursorBench32Source | 70.5% | — | Not comparable |
| VulcanBench v3Source | 87.0% | — | Not comparable |
| AA Coding IndexSource | 76.5% | — | Not comparable |
| AA-SciCodeSource | 60.2% | — | Not comparable |
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | Claude Fable 5 | Claude Haiku 4.5 | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | 59.9% | — | Not comparable |
| AA-GPQA DiamondSource | 92.6% | — | Not comparable |
| AA-HLESource | 53.3% | — | Not comparable |
| AA-Omniscience IndexSource | 40.2% | — | Not comparable |
| AA-Omniscience AccuracySource | 61.4% | — | Not comparable |
| AA-Omniscience Hallucination RateSource | 54.9% | — | Not comparable |
Math2 benchmarks
Multimodal3 benchmarks
Inst. Following1 benchmarks
| Benchmark | Claude Fable 5 | Claude Haiku 4.5 | Result |
|---|---|---|---|
| AA-IFBenchSource | 63.5% | — | Not comparable |
Frequently Asked Questions (2)
Which is better, Claude Fable 5 or Claude Haiku 4.5?
Claude Fable 5 is ahead on BenchLM's BenchAlign leaderboard, 83.68 to 56.58. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 95% and 73.3%.
Which is better for coding, Claude Fable 5 or Claude Haiku 4.5?
Claude Fable 5 has the edge for coding in this comparison, averaging 89.2 versus 73.3. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
Related Comparisons
Choose a model with this week’s evidence
Join 2,000+ readers for ranking moves, pricing changes, and the claims that still need proof.
One email each week. Unsubscribe anytime.