Claude 3.5 Haiku (2024-10-22) vs Grok 3 mini Fast
Claude 3.5 Haiku (2024-10-22) (Anthropic, 200,000-token context) versus Grok 3 mini Fast (xAI, 131,072-token context). Grok 3 mini Fast is cheaper by 4% on a blended token mix. Claude 3.5 Haiku (2024-10-22) uniquely supports vision input and pdf input. Grok 3 mini Fast uniquely supports native reasoning mode. Use the live calculator below to plug your real usage shape into both, then route the winner via Agent Command Center for shadow A/B without code changes.
Bottom line — Claude 3.5 Haiku (2024-10-22) vs Grok 3 mini Fast
Claude 3.5 Haiku (2024-10-22) and Grok 3 mini Fast are priced within 4% of each other, so cost alone is not the deciding factor. The comparison comes down to capabilities, context window, and benchmark performance on the specific task shape your workload demands.
Claude 3.5 Haiku (2024-10-22) ships a 200,000-token context window, 1.5x larger than Grok 3 mini Fast's 131,072 tokens. That headroom matters for long-document RAG pipelines, multi-turn agent sessions that accumulate tool-call history, and codebases where the entire repository needs to fit in a single prompt. If your average prompt stays under 131,072 tokens, the extra context on Claude 3.5 Haiku (2024-10-22) is insurance you may never use — and Grok 3 mini Fast may win on other axes.
On capability surface area, the models diverge: Claude 3.5 Haiku (2024-10-22) supports vision input where the other does not; Claude 3.5 Haiku (2024-10-22) supports pdf input where the other does not; Claude 3.5 Haiku (2024-10-22) supports structured output (json schema) where the other does not. These differences are binary — either your workload needs the capability or it does not. Check whether any critical path in your agent pipeline depends on a capability only one model provides before committing to a migration.
For teams evaluating both models, the recommended path is a shadow A/B test: route production traffic through an OpenAI-compatible gateway, mirror a percentage to the candidate model, score both responses with an automated evaluator (faithfulness, tool-call correctness, latency), and compare cohort-level metrics over two weeks. Future AGI Agent Command Center supports this pattern with a single `base_url` change and built-in evaluators from the ai-evaluation SDK.
Live workload comparison
Same workload run through both models. The cheaper one is highlighted.
strategy: cost-optimized
primary:
model: grok-3-mini-fast
provider: xai
fallback:
model: claude-3-5-haiku-20241022
provider: anthropic
shadow: { sample_rate: 0.05 } # mirror 5% of traffic to compare quality live| Claude 3.5 Haiku (2024-10-22) | Grok 3 mini Fast | |
|---|---|---|
| Input price | $0.800/M | $0.600/M |
| Output price | $4.00/M | $4.00/M |
| Context window | 200,000 | 131,072 |
| Max output | 8,192 | 131,072 |
| Function calling | ✓ | ✓ |
| Vision | ✓ | — |
| Audio input | — | — |
| Reasoning | — | ✓ |
| Prompt caching | ✓ | ✓ |
| Structured output | ✓ | — |
| Pricing verified | May 7, 2026 | Aug 6, 2026 |
Benchmark comparison
Side-by-side public benchmark scores. Greener bar = winner.
Cost at scale: monthly spend at three usage volumes
Estimated monthly cost assuming 1,000 input + 200 output tokens per request — a realistic chat-agent shape. Adjust your own usage in the calculator at the top of this page for an exact number.
| Scale | Claude 3.5 Haiku (2024-10-22) | Grok 3 mini Fast | Delta |
|---|---|---|---|
| Startup 10K requests/day | $480 /mo | $420 /mo | $60.00/mo |
| Mid-market 100K requests/day | $4,800 /mo | $4,200 /mo | $600/mo |
| Enterprise 1M requests/day | $48,000 /mo | $42,000 /mo | $6,000/mo |
At enterprise scale (1M requests/day), a difference of even ~10% in unit price compounds into thousands of dollars per month. Cached input pricing and batch tiers can shift this further — both are surfaced on each model's own page.
When to choose which
Picked from the data above — not vendor marketing. Match the rules to your workload, not the other way around.
Your inputs include screenshots, diagrams, or product photos — Claude 3.5 Haiku (2024-10-22) accepts image input natively, the other doesn't.
Your tasks involve multi-step planning or math-heavy reasoning — Grok 3 mini Fast ships a native reasoning mode that explicitly thinks before responding, the other doesn't.
Capability diff — what you gain and lose on the swap
A specific list of what each model has that the other doesn't. If your workload depends on a row in Only Claude 3.5 Haiku (2024-10-22), switching to Grok 3 mini Fast means re-architecting that path (and vice versa).
- • Vision input
- • PDF input
- • Structured output (JSON schema)
- • Native reasoning mode
Capabilities both share (3)
- ✓ Function calling
- ✓ Streaming
- ✓ Prompt caching
Migration considerations
Concrete differences to wire through your stack before you flip traffic from one to the other.
- Context window changes down 34% when moving from Claude 3.5 Haiku (2024-10-22) (200,000) to Grok 3 mini Fast (131,072). Re-check any prompt that relies on cramming long history or documents.
- Max output tokens differ: 8,192 on Claude 3.5 Haiku (2024-10-22) vs 131,072 on Grok 3 mini Fast. Long-form generation tasks may truncate differently — adjust streaming UI and chunking accordingly.
- Claude 3.5 Haiku (2024-10-22) has capabilities Grok 3 mini Fast lacks: Vision input, PDF input, Structured output (JSON schema). Switching to Grok 3 mini Fast means re-architecting any flow that depends on these.
- Grok 3 mini Fast has capabilities Claude 3.5 Haiku (2024-10-22) lacks: Native reasoning mode. Worth wiring through the agent design before commit.
- Provider changes from Anthropic to xAI. API authentication, rate-limit policy, regional availability, and billing all shift. Most teams route through an OpenAI-compatible gateway (e.g., Future AGI Agent Command Center) so the swap is a single `base_url` change instead of an SDK rewrite.
- Pricing on Claude 3.5 Haiku (2024-10-22) was last verified 112 days ago — confirm against the provider's published rate card before committing to a multi-month migration.
How to A/B test Claude 3.5 Haiku (2024-10-22) vs Grok 3 mini Fast in production
If you're stuck between the two, run them side-by-side on real traffic. Four steps the Future AGI team uses internally:
- 1. Point your existing OpenAI SDK at
https://gateway.futureagi.com/v1. No code change beyondbase_urland a virtual key. - 2. Mark Claude 3.5 Haiku (2024-10-22) primary, mirror 20% of traffic to Grok 3 mini Fast in shadow mode. Both responses are logged; only the primary is served to users.
- 3. Score every shadow response with an evaluator — faithfulness, tool-call correctness, response latency, cost. Built-in evaluators in ai-evaluation cover the common axes.
- 4. Compare cohort-level metrics after two weeks. Switch primary when the candidate wins on what matters to your workload — and stays within your latency budget.
Full walkthrough on the Agent Command Center page.
FAQ — Claude 3.5 Haiku (2024-10-22) vs Grok 3 mini Fast
Which is cheaper, Claude 3.5 Haiku (2024-10-22) or Grok 3 mini Fast? ▾
Grok 3 mini Fast is cheaper by roughly 4% on a blended input + output token mix. Input prices are $0.800/M for Claude 3.5 Haiku (2024-10-22) versus $0.600/M for Grok 3 mini Fast; output prices are $4.00/M versus $4.00/M. The exact savings depend on your input:output ratio — use the live calculator above to plug in your own request shape.
What is the context window of Claude 3.5 Haiku (2024-10-22) versus Grok 3 mini Fast? ▾
Claude 3.5 Haiku (2024-10-22) supports up to 200,000 tokens of context. Grok 3 mini Fast supports up to 131,072 tokens. Claude 3.5 Haiku (2024-10-22) has the larger window by a factor of 1.5x, which matters for long-document RAG, multi-turn agent sessions, and tasks that need to keep an entire codebase in working memory.
Do Claude 3.5 Haiku (2024-10-22) and Grok 3 mini Fast both support tool calling? ▾
Yes — both Claude 3.5 Haiku (2024-10-22) and Grok 3 mini Fast support native function calling. Both also support structured output via JSON schema, so an agent can be ported between them with the same tool definitions.
Can Claude 3.5 Haiku (2024-10-22) and Grok 3 mini Fast process images? ▾
Claude 3.5 Haiku (2024-10-22) accepts native image input. Grok 3 mini Fast does not — you would need to route image-heavy workloads through Claude 3.5 Haiku (2024-10-22) or add a separate vision model in front of Grok 3 mini Fast.
Which model supports prompt caching for cost reduction? ▾
Both Claude 3.5 Haiku (2024-10-22) and Grok 3 mini Fast support prompt caching. Cached input tokens are typically discounted 50–90% versus uncached input, depending on the provider. For agents with a stable system prompt + retrieval context, the cached pricing tier is the real unit economics number to track.
When should I choose Claude 3.5 Haiku (2024-10-22) over Grok 3 mini Fast? ▾
Your inputs include screenshots, diagrams, or product photos — Claude 3.5 Haiku (2024-10-22) accepts image input natively, the other doesn't.
When should I choose Grok 3 mini Fast over Claude 3.5 Haiku (2024-10-22)? ▾
Your tasks involve multi-step planning or math-heavy reasoning — Grok 3 mini Fast ships a native reasoning mode that explicitly thinks before responding, the other doesn't.
How do I A/B test Claude 3.5 Haiku (2024-10-22) against Grok 3 mini Fast in production? ▾
Route both through an OpenAI-compatible gateway like Future AGI Agent Command Center with shadow mode enabled. Send 100% of traffic to your primary model, mirror 10–20% to the candidate, score every response with an evaluator (faithfulness, tool-call correctness, response time), and compare cohort-level metrics for two weeks. Switch when the candidate wins on the metrics that matter to your workload and stays within your latency budget.